Tilez!

Intro
Hey there. You the new intern? Thank god, cause I was never gonna be able to get all this done on my own. Here at Tilez LLC, we sort everything from abstract blocks to cakes. Don’t worry, look at the top for hints to where stuff's supposed to go. You got it, champ. Just make sure to click “Done” When you’re….you know, done.

Level 0 
See, this one’s easy. Just put all the blocks in the square. Without enough trial and error I’m sure a smart cookie like you can figure it out.

Level 1
Now here’s the cakes. Just do the same as the first level and pay attention to those hints.

Level 2 
Here, this one might stump you. Some Larakin has put some pieces in early. Guess we’ll have to work with what we’re given, might be an upper management thing, wouldn’t want to piss them off now, would we?

Level 3 
Oof, this square’s been left in storage too long it seems. Holes all the way through it, and again with these bloody pre-placed pieces. I’ll have a chat with the manager about this.

Level 4 
Hey mate, I’m actually trying to put together my own little restaurant together, be my own boss, you know, but I can’t seem to figure out the best way to pack the tables in, and with you doing such a good job on those other levels, figured those skills might be transferable. Don’t worry about the done button, it won’t work after hours. Just do the best you can, and don’t go stacking the tables on top of each other like a pellock.