Workshop › Doodle Jump-style Climber › Step 13 of 24

How hard should it be?

What we are doing

The higher you climb, the harder it should get. difficulty turns a world height into a number from 0 (the start) to 1 (10 000 pixels up).

```js
const START_Y = 500 // world y of the first platform

// 0 at the start, growing to 1 after climbing 10000 pixels.
function difficulty(y) {
  return Math.min(1, (START_Y - y) / 10000)
}
```

What it means

• START_Y - y is how far above the first platform the height y is.
• Divided by 10 000 it grows from 0; Math.min(1, ...) stops it at 1.

Your turn

1. Under SPEED, write START_Y.
2. Above the keydown listener, write the comment and difficulty.

Skills: Functions

← Lines on the wall Endless platforms →

All steps

1. The jumper
2. Draw again and again
3. Gravity
4. Bounce
5. Steer left and right
6. Through the sides
7. Half here, half there
8. Touch steering
9. Platforms
10. Land on platforms
11. A camera that follows
12. Lines on the wall
13. How hard should it be?
14. Endless platforms
15. Miss and fall
16. Play again
17. Tap to play again
18. Score is height
19. Best score
20. Kinds of platform
21. Moving platforms
22. Traps
23. It breaks!
24. Build it yourself: springs