pxt-calliope/docs/reference/js/lessons/for-loop/challenges.md

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# looper challenges
These challenges will allow you to create a counter from 0-5 and then from 5-0. #docs
### Challenge 0
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Welcome! This [guided tutorial](/bcvgkf) will assist you with the following activity:
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```
for (let i = 0; i < 6; i++) {
led.showNumber(i, 150)
basic.pause(2000)
}
```
### Challenge 1
Go through the loop faster by changing the length of the pause. This is the line you will be editing: `basic->pause(2000)`
```
for (let i1 = 0; i1 < 6; i1++) {
basic.showNumber(i1, 150)
basic.pause(500) // ***
}
```
### Challenge 2
Now, let's count down from 5 instead of counting up to 5. Change the line `basic->show number(i, 150)` to `basic->show number(5 - i, 150)`.
```
for (let i2 = 0; i2 < 6; i2++) {
basic.showNumber(5 - i2, 150) // ***
basic.pause(2000)
}
```
### Challenge 3
Have the number count up in 2's from zero. It should go: 0, 2, 4, 6, 8, 10.