Solomon's Key (ソロモンの鍵, Soromon no Kagi) is a puzzle game developed by Tecmo in 1986 for an arcade release on custom hardware based on the Z80 chipset. It is better known as a 1987 port to the Commodore 64 and the Nintendo Entertainment System, although it also appeared on many other game systems of the time, like the Sega Master System in 1988 and the Famicom Disk System, released in Japan on January 25, 1991.

Carrier Air Wing, released in Japan as U.S. Navy (ユー・エス・ネイビー Yū Esu Neibī), is a 1990 side-scrolling shooting game released for the CP System arcade hardware by Capcom. It is the spiritual sequel to U.N. Squadron, released during the previous year. As with the original, players chose any one of three different jet fighters and battle their way through ten enemy-packed stages. Other ideas carried over from U.N. Squadron include the shop, which allows players to buy weapon and shield upgrades for their jet fighter between stages, and the energy bar, which is replaced by a "fuel bar" which starts full at the start of each stage and decreases as time passes with some fuel lost each time the plane is damaged.