In ChoroQ, you try to create clones of yourself by bumping pieces down to the ground in the correct order. At least in the first couple of levels, the pieces are presented to you in the correct order. Bump the pieces on the top first, and the pieces on the bottom last. They'll fall on top of each other and assemble into a car. You can collect a coin for bonus points after you complete a car.

The controls takes some getting used to. Sometimes you're able to jump onto the platform above, and other times not. I thought perhaps you needed some momentum, but I still wasn't able to consistently jump up; my jumps would often peak much lower than others. It seems to be about position. If you want to jump up to the next level, you don't need momentum, you just need to jump right before the opening in the platform above.

I've seen a few MSX cartridges with these translucent smoke-gray cases. ChoroQ and Elevator Action, which are both Taito releases, have them. It seems way ahead of its time in terms of aesthetic, as that translucent design era didn't really take off until the iMac, and people seemed to get sick of all the colors so they tapered off into limiting the use to medium to dark grays, that must have been in the late 90s or so, but here we observe them from the mid-80s.