From Pong-Story.com:  In 1975, Atari released another successfull arcade game: Stunt Cycle. The goal was to jump over an increasing number of buses. The screen was divided in three horizontal levels representing the road. The first two levels had small obstables, and the bottom level had the jump and buses. One bus was added after each level completed. Of course, this game had nothing to do with PONG, but Atari released a home version of it in game in 1977: Stunt Cycle (model C-450). Sears sold an equivalent, but with 16 additional PONG games (same as those of the Ultra PONG Doubles and PONG Sports IV systems): Sears Motocross (model 99729). Yet another system that combined PONG and non-PONG games. Amazingly, Atari's version did not contain the PONG chip. This could be for marketting reasons.