About 4 Colors

4 Colors is a browser card game built by CodeThisLab, first released in January 2025 and since picked up by aggregator sites like Poki and CrazyGames alongside LemonArcade. The name is a giveaway: this is a browser take on Uno, renamed the way most unlicensed Uno clones are, because Uno itself is a trademark Mattel actively protects. Nothing about the ruleset pretends otherwise — the deck, the colors and the scoring all follow the game most people already learned around a kitchen table.

Uno itself dates back to 1971, invented by a barber named Merle Robbins in Reading, Ohio, as a house variant of Crazy Eights his family kept arguing over. He sold the rights to a local company, International Games, and it eventually became one of the best-selling card games ever printed, now owned by Mattel. 4 Colors keeps that lineage intact: four suits of red, yellow, green and blue, numbered zero to nine, plus the action cards — Skip, Reverse, Draw Two, Wild and Wild Draw Four — that turn a simple matching game into a game of timing.

The loop is exactly what Uno players expect. You are dealt a hand and race to empty it by playing cards that match the color or number on top of the discard pile. No legal card means you draw from the deck until you get one you can play. Action cards let you skip an opponent's turn, reverse play direction, or force a draw, and the game becomes noticeably meaner once two or three of them land back to back. Forget to signal when you are down to your last card and you eat a two-card penalty, exactly as house rules dictate.

This version is single-player: you sit across from up to three computer opponents rather than other people, despite sharing a shelf with genuinely multiplayer card games on the site. That is worth knowing going in, because the AI plays every hand with the same aggression — it holds Wild Draw Fours for the moment they hurt most and rarely misses a chance to reverse the turn order back onto you when you are one card from winning. There is no difficulty slider to soften that, so the opponents you face in round one behave the same way after fifty rounds, which keeps the challenge consistent instead of ramping it up artificially.

What makes 4 Colors worth returning to isn't novelty, it's pace. A round rarely runs past five minutes, the rules need zero explanation to anyone who has played Uno once, and the chaos of overlapping action cards gives even a short match real swings. It suits players who want a card game they can finish during a study break rather than commit an evening to, and it works just as well as a palate cleanser between longer games as a session on its own. It also suits anyone slightly nostalgic for the physical version without wanting to round up three other people and a deck of actual cards.

It runs free in the browser on LemonArcade, no download and no account needed, with tap controls on phones and mouse clicks on desktop that make the whole thing playable one-handed. Sessions are short by design, the difficulty curve is gentle until the action cards start stacking, and because it's AI-only, don't expect a live multiplayer lobby — if you want to play against friends, look elsewhere on the site.

Tips for 4 Colors

• Hold onto Wild Draw Four cards until an opponent is down to one or two cards — used early they just waste a huge penalty on a full hand.
• Watch the discard pile color trend before playing a Wild card; matching what an opponent just avoided often locks them out for a full turn.
• Play number cards before action cards when you have a choice, since keeping Skips and Reverses in hand gives you more control over who draws next.
• In three-opponent games, use Reverse to skip past whichever AI opponent has the fewest cards left rather than the one closest to your turn.
• Don't stack action cards recklessly — the computer opponents retaliate with their own Draw Twos the moment you leave yourself with no color-safe card.
• Count colors as the round goes on; if red hasn't appeared in several turns, opponents are likely hoarding it and a red card in your hand is safer to hold.
• Play defensively once any opponent reaches two cards — favor cards that force a draw over cards that simply empty your hand fastest.

Did you know?

• 4 Colors is developed by CodeThisLab and was first released in January 2025.
• It is a browser adaptation of Uno, renamed because Uno is a trademarked Mattel product that most unlicensed clones cannot use in their title.
• Uno was invented in 1971 by Merle Robbins in Reading, Ohio, as a home variant of Crazy Eights, before being sold to International Games and eventually acquired by Mattel.
• Despite being listed under the Multiplayer category on some portals, this version is played solo against up to three computer-controlled opponents, not live human players.
• The game carries a 4.4-out-of-5 rating across roughly 1,300 votes on its distributor listing, and is also available on PC, Android and iOS outside the browser.