Tetroid is a logic puzzle invented by Naoki Inaba of Japan. A rectangular or square grid contains black cells. The goal is to divide the grid into regions of exactly four cells, to form an L, I, T, S or O tetromino.
These puzzles are published as part of the Steemit Puzzle Digest. Fun and challenging puzzles test your logic and stretch your brain!
If you enjoy puzzles and games of logic, Steemit Puzzle Digest is the blog to follow!