In Fiendish Freddy's Big Top O'Fun the player must perform various circus acts, in a game play style not dissimilar to Konami's Track and Field or Epyx's California Games.
Acts in the game include the high wire, juggling, platform dive and human cannonball. Each act has progressive levels of difficulty. For instance, in the diving, the player must land in progressively smaller receptacles, the final part requiring successful navigation into a tea cup!
The controls and player input required change with each act.
The game was released across most 8-bit computer systems. The game was included as part of a bundle on some systems. On the Commodore 64 this came in the form of a 4 game cartridge bundled with later hardware releases. Fiendish Freddy shared the cart with Klax, International Soccer, and Flimbo's Quest.