Clockwiser is a computer game, developed by Team Hoi for the Amiga, DOS and Windows. It was published in 1994 by Rasputin Software. In 2008, a free online version of Clockwiser was released by the programmer responsible for the original DOS and Windows versions.
Clockwiser is a puzzle game with 100 levels (Amiga version) and 110 levels (PC version and Web version). The levels consist of various arrangements of blocks. Each level is divided into two sections, an active one on the left and a static one on the right. The player's task is to make the section on the left look exactly like the one on the right.
What makes the game challenging is that the player cannot move individual blocks directly. Instead, the player can select a rectangle-shaped group of blocks and move them along the rectangle's edge, either clockwise or counterclockwise. The blocks are subject to gravity, so moving a block on top of empty space makes it fall down. On later levels, various other objects come into play, such as metal blocks that can't be moved, teleporters, and bombs which destroy blocks they fall on.
One level in the game (called What happened, Deputy Dawg?) is the easiest level ever in a computer game. As soon as the level starts, it is completed. This level is impossible to lose.
In 2008, the game was ported to Java and published online.