Curious puzzler where you move a disk-like object around a 10x10 square grid, sliding the rows and columns around as you do so. An assortment of white blocks and metal boxes with a tiny letter 'T' on them are placed in preset positions on each level.
The blocks cannot wrap around the edges of the grid, which effectively limits the player's movement. The T-boxes however can wrap around the grid and the goal is to slide all T-boxes off edge of the grid at a location marked by a white arrow.
It's actually quite a bit of fun to play. There is a time limit on each level, but since there is a pause feature which does not hide the grid, you could keep pausing the game whilst studying it, making the limit somewhat redundant.
You do have a limited number of tries per level and each level is password protected and gets succesively more difficult.
Overall, this YS covertape game is quite good fun for a while.