I have forgotten to tell you how to play.
There are 2 kinds of blocks:
Alive: White background with dark number
Dead: Grey background with grey number
There are 2 type of results:
Win: Kill all "Alive" blocks with limited steps.
Lose: Exceed the limited steps.
How to play:
Clicking the number buttons at the bottom will turn all "Alive" blocks next to "Dead" blocks with the button's number to "Dead".