Use the logic described by the clue to help toggle the tiles in the grid.
You can Print sheets of the game at Foldapuz or Play it in Unfolded.

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How To Play

The grid above has some empty tiles, and some filled tiles.
The clue will say something like "Fill if exactly 2 neighbours are filled"
You then need to go through each tile checking its neighbours, horizontally and vertically (but not diagonally!) and filling in the bottom grid where appropriate.

It's a bit like that Game of Life thing, except you have to do it yourself!

What I Didn't Do

This is a nice and simple Foldapuz game, and I'm surprised I haven't done anything like it before, because it's a really obvious idea for a game.

... I wonder if I have?!

It's probably already in Foldapuz, isn't it?
I didn't check.

You can Print sheets of the game at Foldapuz or Play it in Unfolded.