Tetris Online. Lines and Blocks. Original adaptation of the Tetris game. From the top, colored blocks will descend vertically and horizontally by 1 or more white lines. To remove a block from the game board, it must first be free of the white lines that cross it. Each line will be eliminated when you manage to chain 3 or more blocks with lines in the same direction. Remove the lines first so that the blocks are removed. This original game of Tetris ends when there is no space available to place the pieces that are generated. Accumulate points by keeping the Tetris game active.