Zero Grid
Bring every number down to zero in Zero Grid.
Click on a square to reduce or increase its value, but be careful: it also affects its neighbors.
Plan each move, chain reactions, and empty out every grid with the fewest moves possible!
Challenge yourself across 20 handcrafted boards of increasing complexity.
Can you zero them all out?
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So you can add or subtract exactly five at a time no matter what, right? Level 13 has a total that doesn't divide by five, so it's unwinnable unless I missed a game mechanic.
Actually not - adjacent blank squares or squares already at +3/-3 can nullify this rule you identified (there may be, in some cases, less than 5 interactable squares if there are many blank squares or maxed out squares). But this isn't the case on level 13 :)
Anyway, level 13 can be beaten in 15ish moves (check screen, one click away from win). Try to play around with bringing max or min values on squares (+3, -3):
In general all levels have been generated starting from a blank grid and clicking back and forth, and then giving a generous amount of moves to the player to "reverse" such process.
There is also a secret trick, which costs an hefty amount of moves: bringing all the squares in a + up to 3 or -3, and then bringing them down/up to 0. Costly, but works! ;)