I've beaten over 70 vanilla levels, and following achievement haven't been unlocked: * Locust Complete 60 levels * Ninja Complete 70 levels

I'n enjoying the game on Ubuntu 18.04 but it keeps crashing between levels. It happens often enough to be quite annoying.

"We're Square Make your frist square" "frist"

Can I get any clue about which levels give the opportunity to form 4 squares at the same time, so I don't need to retry them all?

At least I do according to the minimum spec listings. That's kind of a surprise. I would have thought that this kind of game would have run on many of the older Mac Os's. One of the nice features of simple puzzle games is that they will usually run on potatoes. I am still running El Capitan because there are a few older games out there that seem to have problems with Sierra & High Sierra....