Pipe (itch)

Piper-like game for DOS Ive made in mid 90s. You have to create a pipeline as long as possible. As soon as you start building, the water starts flowing. The tiles you can build are displayed in the right (blue on will be placed next). Placing each tile costs money. Replacing a tile costs extra money. Each filled pipe segments yields money and score. Filling a crossroad both directions gives bonus score. The game ends if the water cannot flow any further (i.e. to a wrong tile or to an empty tile)...