bittos e

bittos e is a fast-paced puzzle game, where the player has to fill a grid with tetrominoes shapes to form square blocks and make them disappear. The squares are eliminated automatically every few seconds, and the surviving pieces that remain unused on the field become red after a while, starting to multiply and accumulate, eventually taking over all the space available. These encumbering pieces can only be removed by assembling a blue square besides them, sometimes starting a chain reaction with multiple eliminations and bonus points. The player must create these squares as fast as possible, to clear all the board before it becomes cluttered with red pieces and the game is over.

There are three modes, with the last two being unlocked while progressing through the game. In adventure mode, the objective is to complete a series of increasingly faster levels, each with nine elimination waves where a set number of pieces have to be destroyed before moving to the next one. In time attack mode, the goal is to achieve a high-score before the allotted minutes are over. In survival mode, an endless stream of red pieces keeps appearing and closing in from the edges of the field toward the middle, and the player has to frantically remove all of them.