Curve Fever Classic – Achtung, die Kurve! in your browser
Curve Fever was one of the most played Flash games of the early 2010s: a fast, chaotic party game where every player steers a growing line and tries to survive the longest. When Adobe Flash was switched off the original stopped working. This is a free, open-source HTML5 remake of Curve Fever 1 that recreates the original's rules, speeds, powerups and computer opponents as closely as possible, so you can play it again without Flash, plugins or downloads. It is itself a remake of the 1995 DOS classic Achtung, die Kurve! (also known as Zatacka).
How to play Curve Fever
- Click a player's name or press its number (1–6) and press the two keys you want to steer with.
- Add at least two players, or click CPU to add computer opponents.
- Choose Arcade (with powerups) or Classic (old-school Achtung, no powerups).
- Press Space to play. Space also starts each round and pauses the game; Esc returns to the menu.
Every time a curve crashes, everyone still alive scores a point. The goal is 10 points per opponent, and you have to win by at least 2 points. Lines have random holes you can slip through.
Default controls
| Player | Left | Right |
|---|---|---|
| Fred (red) | ← | → |
| Greenlee (green) | Z | X |
| Pinkney (pink) | N | M |
| Bluebell, Willem, Greydon | pick any keys you like | |
Powerups
Green powerups affect you, red ones affect your opponents and blue ones affect everybody.
- Speed up (green, 3 s) – you go twice as fast, with wider turns.
- Slow down (green, 10 s) – you go half as fast, with tighter turns.
- Thin line (green, 15 s) – your line is half as thick.
- Fly (green, 5 s) – you leave no line and can't crash into lines.
- Go through walls (green, 15 s) – the walls wrap around for you.
- Square turns (green, 15 s) – you turn in sharp 90° corners.
- Slow down others (red, 5 s) – everybody else goes half as fast.
- Speed up others (red, 3 s) – everybody else goes twice as fast.
- Thick lines (red, 7.5 s) – everybody else's line becomes twice as thick.
- Square turns for others (red, 7.5 s) – everybody else turns in 90° corners.
- Reversed keys (red, 5 s) – everybody else's left and right are swapped.
- Open borders (blue, 10 s) – everyone can go through the walls.
- Clear (blue) – wipes every line off the field.
- More powerups (blue, 5 s) – powerups appear four times as often.
- Random – a surprise: any of the powerups above.
What's new compared to the Flash original
- Runs in any modern browser, on Windows, macOS, Linux and ChromeOS – no Flash player.
- Smooth 100 Hz movement instead of 25 frames per second, with the same speeds and turning circle.
- Add computer players to any seat, mixed with human players.
- Your players, keys and settings are remembered.
- Fullscreen (press F), touch controls against the computer, and offline play once loaded.
- No ads.
FAQ
Is this the official Curve Fever?
No. It's an unofficial, non-commercial fan remake of the 2010 Flash version, written from scratch in JavaScript. Curve Fever is a trademark of its owners; the modern official game is Curve Fever Pro.
Can I play online against other people?
This version is local multiplayer, like the original: up to 6 people around one keyboard. You can also play against the computer.
Does it work offline?
Yes. After the first visit the game is cached, so it keeps working without an internet connection.