Assembler is a fun physics-based game where you get to toss around boxes, beams and other shapes, trying to get a box into a target somewhere in each level. It's difficult to write a review of Assembler without becoming distracted for an hour, playing Assembler. The puzzles become challenging in later levels, but a lot of the fun is in throwing boxes around, hitting them with beams, and making goofy little catapults.

Some levels have more than one target to reach, and a lot of them have metal bits that you have to work around. Solving the puzzles isn't conceptually difficult so much as tricky to actually execute. You can see the structure you need to build, but making it balance properly is another matter. The Assembler high scores are based on time, too, and it's even more challenging to complete some of the levels when you're trying to do it as quickly as possible.