Multiple early "black box" NES releases' cartridges produced during the console's US launch in Winter 1985 didn't use NES ROM chips, but rather Famicom ROM chips with a built-in converter. The 15 NES launch titles, and the only games known to have these chips, are:

•10-Yard Fight
•Baseball
•Clu Clu Land
•Duck Hunt
•Excitebike
•Golf
•Gyromite
•Hogan's Alley
•Ice Climber
•Kung Fu
•Pinball
•Stack-Up
•Tennis
•Wild Gunman
•Wrecking Crew

All of these games would eventually be reprinted with regular NES chips.

Gyromite is perfectly playable, and some may argue better, without using ROB the Robot. You can push the pillars up and down using a second NES controller while the first controller commands Professor Hector as it would in ROB play, making the game either into a faster-paced co-op platformer for two players, or an unconventional two-controller game for one player in a similar manner to Atari's Raiders of the Lost Ark. This technique cannot be performed on Stack-Up.