Level 1-2:
Self-explanatory.
Level 3:
Shoot the wall.
Level 4:
Move right.
Level 5:
Jump to quake. Quakes bring the wall down.
Level 6:
Go back, take the key.
Level 7:
Down to dig.
Level 8:
Seriously, you have never played a platformer before?
Level 9:
Take the platforms. Be careful.
Level 10:
Memory is good. Use that. (You can double jump.)
Level 11:
Go up, up, up.
Level 12:
Literally.
Level 13:
Go up so the spikes won't hit you.
Level 14:
Jumps return visibility slightly.
Level 15:
Touching a wall reveals it's groupmates.
Level 16:
Hit them in that order, Mario-style.
Level 17:
Hit CONTROL 5 times.
Level 18:
Wait a bit.
Level 19:
Jump on the text.
Level 20:
The old right click level.
Level 21:
Avoid the darkness.
Level 22:
Run, run, run!
Level 23:
Stay in the middle when he's running, double jump when he approaches.
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 "riot control"){kind=icon}