In 1010 Fish Blocks, players are presented with a grid of squares, each containing a puzzle piece with a certain number of horizontal or vertical holes. The objective is to fill the gaps in the grid by moving the puzzle pieces around to create a complete line without blocking other pieces that are still to be placed.
The game's core is based on logic and creativity as players must figure out how to fit the pieces together. There is no time limit, and the game runs directly in the browser without the need for a download or registration. The challenge lies in solving the puzzles within the grid, making use of the available space to fill in all the holes.