Movement of the `hand', which can move one step in the four orthogonal directions, is hindered by obstacles, many called with names from chess. Pawns are shows as soldiers. When moved, they can continue to move in the direction they face, possibly destroying `crystal blocks'. Queens are a little similar to pawns, but continue to move in the direction pushed, and do not destroy crystal blocks. Crystal blocks cannot be moved, but can be destroyed by the hand when standing next to it. Knights are similar to pawns, but explodes when it his a rock, or when a pawn hits a knight. The hand is killed when it is observed by a bishop on a diagonal line, or by a rook on a orthogonal line.
The idea of the game is to find the right way to push the different obstacles such that the hand can make its path to the place with the king symbol. At a few intermediate places, the position can be stored, but often one needs to redo a part of the puzzle. Some other places allow to see the whole level. There are also `Teletransporters' which transport the hand to a different position in the level.
(This is not a full description of all features of the game.)
For people that are fond of these types of puzzles, the program may be nice, although there are sufficiently many freeware and shareware programs available that are at least as much fun. Others I would recommend to leave the program in the bargain bins of the computer shops where it can be found.