Join our Discord to chat with fellow friendly gamers and our knowledgeable contributors!

Published by
Developed by
Not an American user?


In this logical game you have to move a sphere around cogs to collect a formula in the correct order. To move between cogs you press the space bar at the point they meet. Holding down W will allow you to move the opposite way the cog is moving but here you move slower, releasing W allows you to travel faster the way the cog is moving. Some cogs have baddies on them and you must time your transfer to it without being hit by it.

On the screen you see a small part of the game area. As well as the main playing area you can also see your score, lives, level and parts of the formula collected.


πr² Commodore 64 Title screen.
πr² Commodore 64 Moving around the cogs.
πr² ZX Spectrum Moving between wheels
πr² ZX Spectrum Being chased

Promo Images

There are no promo images for this game

Alternate Titles

  • "Pi-r Squared" -- In-game title

User Reviews

There are no reviews for this game.

Critic Reviews

ASM (Aktueller Software Markt) Commodore 64 Sep, 1987 9.2 out of 10 92
ASM (Aktueller Software Markt) Commodore 64 May, 1991 9.8 out of 12 82
ASM (Aktueller Software Markt) ZX Spectrum Sep, 1987 9.2 out of 12 77
Your Sinclair ZX Spectrum Jun, 1989 7 out of 10 70
Commodore User Commodore 64 Oct, 1987 5 out of 10 50


There are currently no topics for this game.



πr² is the formula to work out the area of a circle.
Contributed to by Hello X) (11591) and Kabushi (257496)