How many puzzles does the game contain? Thanks :)

the screen is just dark after the intro, i can interact with whatever is in there but it just doesn't show anything

i have been wracking my brain on this one for almost an hour now and yet cannot find out how to do this one i managed to get every one except the 9's over to the other side but no combo of blocks on or off let me switch the 9 blocks it is section 2-3 the "weight" puzzle. and honestly i have tried the hint but... the hint is more useless then my brain...

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Welp, I am completely stuck. I read all three custom hints, reproduced the pattern in the last. Bouncing the laser right back doesn't seem close to work. I thought I'd make it do a loop back through the left door, but the grid-based bounces are heavily limited in that regard. That could be solved by offsetting myself like at the end of the main game, an option that seems unavailable here. ...