Curve fever · up to 6 players
Each player controls a coloured curve that moves forward at constant speed. You cannot stop, slow down, or reverse. Your only controls are turning left and right. The goal is to stay alive longer than everyone else.
In online mode, share the room code with friends and wait for everyone to press Ready. A 3-second countdown starts, then all curves launch at once. Steer with the left and right arrow keys on a keyboard. On mobile, tap the left half of the screen to turn left and the right half to turn right.
Your curve leaves a solid trail behind it. Hitting any trail, including your own, or hitting the wall ends your run for that round. The last curve still moving wins the round. Points are awarded based on survival order: dying first scores nothing, and surviving longest scores the most. Scores carry across rounds, so you can come back from behind.
Every curve passes through occasional gaps: short stretches where the trail is not drawn. These gaps let other players pass through your trail and open up parts of the board that would otherwise be blocked. The timing is random, so you cannot predict when your own gap will appear. Experienced players watch for opponents' gaps and try to navigate through them before they close.
Achtung, die Kurve (German for "Attention, the curve!") is a multiplayer action game that originated as freeware in 1995, created by a group of Swedish students. The game spread through local area networks at schools and universities across Scandinavia and Germany during the late 1990s and became a staple of office and dormitory LAN parties.
The game later inspired commercial titles like Curve Fever and Snake.io, but the original formula has never been improved on: simple controls, immediate consequences, and a spatial puzzle that gets harder the longer anyone stays alive. A full lobby of six players typically produces a round that lasts under a minute, which makes it easy to play many rounds in a session without losing momentum.
This version supports up to 6 players online with private room codes, or solo play against bots of varying difficulty. No account or download is needed.
Up to 6 players can join a single online room. Create a room, share the link or code, and everyone who joins before the host starts the game will play together.
Yes. Switch to the "vs Bots" tab in the lobby and choose how many bots to add. The bots use a lookahead AI that tries to keep as much open space in front of them as possible. You can add between 1 and 5 bots.
On a keyboard, use the left and right arrow keys. A and D also work, as do Q and E. On mobile, tap the left half of the screen to turn left and the right half to turn right.
Points are awarded by survival order each round. With 4 players, the first to die scores 0, the second scores 1, the third scores 2, and the last survivor scores 3. Scores accumulate across rounds until you close the game or start a new session.
Yes. No account, no download, no cost. Open the game in any browser on desktop or mobile and start playing.
If you like Achtung, try Snake for a similar avoid-your-own-trail challenge in solo mode. For multiplayer games, Tic Tac Toe, Rock Paper Scissors, and Ultimate Tic-Tac-Toe all support online play with friends.