Workshop › Asteroids › Step 34 of 41

Faster every wave

What we are doing

Every wave's rocks are 20% faster: the speed is multiplied by 1 + (wave - 1) * 0.2. Wave 1 is ×1, wave 3 ×1.4, wave 6 ×2. A multiplier that grows with the wave is a simple, readable way to tune difficulty.

```js
// Smaller asteroids are faster, and every wave is 20% faster than the one before.
const speed = (0.6 + Math.random() * (4 - size) * 0.5) * (1 + (wave - 1) * 0.2)
```

What it means

• The old speed goes in parentheses and is multiplied by the wave factor; the comment moves to its own line.

Your turn

In makeAsteroid, replace the speed line with the comment and the new line.

Skills: Velocity and gravity, Game states

← The next wave One function to start →

All steps

1. Black space
2. Where the ship is
3. Which way it points
4. A triangle ship
5. Which keys are down?
6. Turning
7. The game loop
8. Thrust and drift
9. A little friction
10. A speed limit
11. Around the screen
12. Making a bullet
13. Fire!
14. Bullets fly
15. A lifetime for bullets
16. Making a rock
17. Four big rocks
18. Drawing the rocks
19. Jagged rocks
20. Drifting rocks
21. When do two circles touch?
22. Breaking a rock
23. Bullets hit rocks
24. Points
25. Show the score
26. Losing a life
27. A rock hits the ship
28. Show the lives
29. What time is it?
30. A moment of safety
31. Blink while safe
32. Waves of rocks
33. The next wave
34. Faster every wave
35. One function to start
36. Playing or over
37. Game over
38. Best score
39. GAME OVER
40. Play again
41. Build it yourself: hyperspace