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A deck builder is the part of a card-game platform where you search a card database and assemble a deck list. On Untap.in it sits next to a virtual table, so the same tool that lets you build also lets you import an existing list, share it by link, and immediately play-test it against live opponents or an empty seat. Use it when you want to construct, store, or iterate on a deck before or between matches; it is not a rules engine, so it will not stop you from building something illegal.

Deck builder vs. deck tester vs. play-testing table

These three get used interchangeably, but they do different jobs:

Untap.in combines all three. You build in the deck builder, goldfish solo to check opening hands and mulligans, then open a table or join from the public lobby for a real match. Because the platform does not enforce rules, you and your opponent track the game state the way you would across a physical table.

How to build a deck

1. Pick the game you are building for. Untap.in hosts full card databases for 40+ games, including Magic: The Gathering, Pokémon TCG, Yu-Gi-Oh!, One Piece Card Game, Disney Lorcana, Flesh and Blood, Star Wars: Unlimited, Digimon Card Game, Dragon Ball Fusion World, Final Fantasy TCG, Cardfight!! Vanguard, and Android: Netrunner.
2. Search the card database for the cards you want and add them to the list.
3. Save the deck. You can share it with a link so others can view or copy it.
4. Move to testing: goldfish it solo, or take it into a live game.

If you already have a list, skip the searching. Paste a plain-text decklist, or import one by URL from a popular deck-building site, and start play-testing straight away.

Building for a custom or homebrew game

Untap.in is not limited to published games. You can upload your own cards — art, text, and whatever fields your game needs — and build decks from them exactly like a published game. Since no rules are enforced, a homebrew set behaves the same as anything else on the table.

For fleshing out a prototype, solo play is the fastest route: goldfish a deck against an empty seat, or use Deck vs. Deck (a supporter mode) to sit on both sides and play two prototypes against each other.

Draft, cube, and sealed

The same platform covers limited formats. You can run booster drafts with friends, and bots fill any empty seats so a pod is always ready. That makes it usable for testing a cube or a sealed pool without coordinating a full group.

What to check before you commit

• Rules enforcement: none. If you need the platform to catch illegal plays or auto-resolve triggers, this is not that kind of tool.
• Cost: Untap.in states it is free to play-test — building, goldfishing, drafting, and live multiplayer at no cost — with optional supporter perks. Deck vs. Deck is listed as a supporter mode.
• Install: none required. It runs in a browser on desktop, tablet, and phone, and can install as an app from the browser.
• Affiliation: Untap.in describes itself as an independent, fan-built play-testing platform, not affiliated with or endorsed by the game publishers.

If your goal is to get a list out of your head, onto a table, and in front of an opponent quickly, the build-import-share-test loop is the whole workflow. If your goal is a rules-accurate simulation, look for a platform that enforces game rules instead.

Untap.in is a free, browser-based virtual table for play-testing CCG and TCG decks. You build or import a deck, then test it against live opponents worldwide or against an empty seat — no download, install, or patching required. It's the right tool if you want to rehearse lines, test opening hands, or try a brew before buying cards, and you're comfortable managing the rules yourself: Untap.in does not enforce any game's rules, so you play the way you would across a real table.

How to start play-testing

1. Build or import a deck. Search the full card database for any supported game, or paste a plain-text decklist or import one by URL from popular deck-building sites. You can also share your deck with a link.
2. Choose how to test. Open a table or join a game from the public lobby for live multiplayer, or goldfish solo against an empty seat to check opening hands, mulligans, and your lines before a real match.
3. Play and review. Watch live matches, undo a misclick, or play a finished game back turn by turn.

Because the platform doesn't enforce rules, both players track life totals, triggers, and state themselves — the same as sitting across a physical table.

What you can do on Untap.in

• Build decks — full card databases for 40+ games, with plain-text or URL import and shareable links.
• Play live — open a table or join from the public lobby on desktop, tablet, or phone.
• Goldfish solo — test opening hands and mulligans against an empty seat.
• Draft, cube, and sealed — run booster drafts with friends; bots fill empty seats so a pod is always ready.
• Spectate and rewind — watch live matches, undo a misclick, or replay a finished game turn by turn.
• Custom games — upload your own cards (art, text, and whatever fields your game needs) and build decks from them like any published game.

Supported card games

Untap.in supports 40+ games, including:

…and 30+ more.

Common questions

Is it free? Yes — building decks, goldfishing, drafting, and joining live multiplayer games are all free. Optional supporter perks help keep the servers running, and some modes (like Deck vs Deck) are supporter features.

Do I need to download anything? No. It runs in your web browser on desktop, tablet, and phone, and can install as an app straight from the browser.

Can I import a decklist I already have? Yes — paste plain text or import by URL from popular deck-building sites, then start testing immediately.

Can I play my own custom card game? Yes. Upload your own cards and build decks from them exactly like a published game. Since no rules are enforced, a homebrew set behaves the same as anything else on the table — goldfishing or Deck vs Deck is the fastest way to flesh one out.

Untap.in is an independent, fan-built play-testing platform and is not affiliated with, endorsed by, or sponsored by the game publishers whose cards it supports.

A TCG, or trading card game, is a card game played with cards that are sold in randomized packs, collected, traded between players, and assembled into custom decks before you sit down to play. The defining feature is the "trading" part: your collection is a resource you build up and swap, and deck construction is as much a part of the hobby as the matches themselves. If you want to try one without buying cards, browser-based tables like Untap.in let you build a deck and play-test it against live opponents for free.

TCG vs. CCG: what's the difference?

The two terms describe the same kind of game, and most players use them interchangeably.

In practice, whether a game is called a TCG or a CCG usually comes down to branding rather than mechanics. Magic: The Gathering, Pokémon TCG, and Yu-Gi-Oh! are all commonly described both ways. The "collectible" side covers how cards are acquired; the "trading" side covers what you do with them afterward.

The core loop of a trading card game

Playing a TCG follows a repeating cycle:

1. Acquire cards — through booster packs, starter decks, singles, or trades with other players.
2. Build a deck — choose a format and a strategy, then select the specific cards that support it.
3. Play matches — shuffle up and face an opponent, using the deck's rules to resolve what happens.
4. Revise — after playing, swap cards in and out based on what worked and what didn't.

Step 4 is where most of the time goes. A deck is rarely finished; it's tuned against the opponents and formats you actually face.

What playing a match actually involves

A match is two players (sometimes more) using their constructed decks under a shared rule set. Each game has its own turn structure, resource system, and win condition, but the common shape is:

• Draw an opening hand and decide whether to keep it (many games allow a mulligan).
• Take turns playing cards, spending whatever resource the game uses.
• Reduce the opponent's life total, deck them out, or hit some other defined win condition.

Rules enforcement varies by where you play. Official tournaments and digital clients apply the rules automatically; playing across a physical table — or on a rules-agnostic online table — means the players track the game state themselves.

Which games count as TCGs?

The category is large. Well-known examples include:

• Magic: The Gathering
• Pokémon TCG
• Yu-Gi-Oh!
• One Piece Card Game
• Disney Lorcana
• Flesh and Blood
• Star Wars: Unlimited
• Digimon Card Game
• Final Fantasy TCG
• Cardfight!! Vanguard
• Android: Netrunner

Untap.in, a browser-based play-testing table, lists 40+ supported games including all of the above, and also lets you upload your own cards to build decks for a custom or homebrew game.

How to start without buying cards

If you want to learn a TCG or test a deck idea before committing money, you can play-test online in a browser. On Untap.in:

1. Build a deck — search the card database for a supported game, or import an existing decklist as plain text or by URL from a deck-building site.
2. Goldfish solo — play against an empty seat to check opening hands, mulligans, and your early turns before facing anyone.
3. Play live — open a table or join a game from the public lobby on desktop, tablet, or phone.
4. Draft or sealed — run a booster draft with friends; bots fill empty seats so a pod is always ready.
5. Review — spectate live matches, undo a misclick, or replay a finished game turn by turn.

Two things to know before you start: Untap.in does not enforce any game's rules, so you and your opponent track the game state the way you would across a real table. And it runs in the browser with nothing to download or patch. The site describes itself as free to play-test, with optional supporter perks; check the site directly for current details on any paid features.

That rules-agnostic approach is a trade-off worth weighing. It's flexible enough to handle homebrew cards and casual play exactly like a published game, but it won't catch illegal plays for you — which makes it better suited to players who already know the game or are learning it alongside someone who does.

CCG stands for collectible card game: a card game where players build custom decks from a pool of individually collected cards and play them against opponents. In everyday use, CCG and TCG (trading card game) describe the same hobby — most games fit both labels, and the difference comes down to emphasis rather than rules. If you're searching for a game to play or a place to test a deck, treat the two terms as interchangeable.

CCG vs. TCG: What's the Actual Difference?

Both terms describe games with the same core loop: collect cards, build a deck, play matches. The distinction is mostly about which part of that loop the name highlights.

In practice, publishers and players mix the terms freely. Magic: The Gathering, Pokémon TCG, and Yu-Gi-Oh! are all commonly called both CCGs and TCGs. If a game has booster packs, a secondary market, and deck construction, either label fits.

Why the Terms Get Used Interchangeably

The overlap is real, not just marketing. A game only works as a CCG if cards are collectible in randomized or limited quantities — which is exactly what makes them tradable. Conversely, a TCG needs deck building to be meaningful, or there'd be nothing to trade toward. The two concepts describe the same product from different angles.

What Defines a CCG?

Three mechanics show up in essentially every collectible card game:

• Collection — cards are acquired in packs, starter decks, or singles, and rarity varies.
• Deck building — you choose a subset of your cards, usually with size and copy limits, before playing.
• Opponent play — matches are played against another player, not just solitaire-style puzzles.

Some games add draft and sealed formats, where you build a deck on the spot from freshly opened packs. Others support cube drafts, where a curated pool is reused. These formats still count as CCG play because collection and deck building remain central.

Examples of Well-Known CCGs

Games you'll see labeled as CCGs or TCGs include:

• Magic: The Gathering
• Pokémon TCG
• Yu-Gi-Oh!
• One Piece Card Game
• Disney Lorcana
• Flesh and Blood
• Star Wars: Unlimited
• Digimon Card Game
• Dragon Ball Fusion World
• Final Fantasy TCG
• Cardfight!! Vanguard
• Android: Netrunner

Beyond these, dozens of smaller and older titles follow the same structure.

Where to Play-Test CCG Decks Online

If you want to try a deck before buying cards or committing to a tournament, Untap.in is a browser-based table for play-testing CCG and TCG decks. It requires no download or install and runs on desktop, tablet, and phone.

What you can do there:

• Build decks — search card databases for 40+ games, or import a decklist as plain text or by URL.
• Play live — open a table or join a game from the public lobby against opponents worldwide.
• Goldfish solo — test opening hands, mulligans, and your lines against an empty seat.
• Draft, cube, and sealed — run booster drafts with friends, with bots filling empty seats.
• Spectate and rewind — watch live matches, undo a misclick, or replay a finished game turn by turn.

Two things to know before you start: Untap.in does not enforce any game's rules, so you play the way you would across a real table — you're responsible for tracking life totals, triggers, and legality. And it supports custom card games: you can upload your own cards with art, text, and whatever fields your game needs, then build decks from them like any published game.

The site states that play-testing is free, including deck building, goldfishing, drafting, and live multiplayer, with optional supporter perks. If cost matters to you, confirm current terms on the site before relying on that.

Code Breaker is an online Mastermind-style logic game where you crack a hidden colour code using deduction and feedback. The site describes it as a single-player puzzle with a Top 10 Players list, and the available page evidence does not document a live two-player or head-to-head multiplayer mode. So if you are looking for "multiplayer" here, the practical answer is: treat it as you against the game's secret code, with the shared leaderboard as the competitive layer. The steps below cover how that works, how to set a code for someone else to try, and what to check if a session will not start.

What "multiplayer" means in Code Breaker

The site's own description — "the classic game of logic and deduction. Can you crack the code?" — frames the challenge as solver versus code, not solver versus solver. The Top 10 Players list is the only competitive element named in the source material.

How a round actually plays out

The game follows standard Mastermind rules:

1. A secret code of coloured pegs is set (by the game, or by a friend if you are playing a manual two-player variant).
2. The code breaker makes a guess by placing a row of coloured pegs.
3. The game returns feedback, usually as black and white pegs:
   • Black peg — correct colour in the correct position.
   • White peg — correct colour in the wrong position.
4. You use that feedback to narrow down the possibilities and guess again.
5. You win by matching the code exactly within the allowed number of turns; you lose if you run out of guesses.

If you want to play against another person without an online mode, the workable approach is a shared screen: one player sets a code and keeps it hidden, the other guesses, and you swap roles after each round. The feedback logic stays the same — the person who set the code gives the black and white peg counts.

Setting up a code for an opponent

Because the site does not document an opponent-invite flow, setting a code for someone else is a manual arrangement:

• Agree on the number of pegs in the code and the number of colours in play before you start.
• The code setter writes the code down or memorises it and does not reveal it.
• After each guess, the setter calculates black and white pegs and reports only the counts, never which peg is which.
• Track turns so both players get the same number of attempts.

Winning, losing, and scores

• Win condition: the guessed row matches the secret code exactly.
• Lose condition: you exhaust your allowed guesses without matching the code.
• Scoring: the site maintains a Master CodeBreaker Top 10 Players list, so results feed into a public ranking rather than a private match score.

If a multiplayer game won't start

Since no online multiplayer session is documented, most "it won't connect" problems come from expecting a feature that is not described. Check these in order:

• Confirm you are on the correct game page and that the game itself loads and accepts guesses.
• If you are attempting a two-player variant, confirm both players agree on code length and colour set — mismatched rules cause confusing feedback.
• If you expected an invite or lobby, note that none is listed in the site's description; use the shared-screen method instead.
• If the page will not load at all, that is a site or connection issue, not a multiplayer setup issue.

Bottom line

Code Breaker is a solo deduction game with a public Top 10 leaderboard, not a documented online multiplayer title. Play it as you versus the hidden code, and if you want a head-to-head game, run it manually with a friend on one screen using the same black-and-white peg feedback.