SonSon II is the 1989 sequel to Capcom‘s 1984 arcade game, SonSon, and was developed by NEC Avenue and released exclusively for the PC Engine. Once again it is loosely based on the adventures of the “Monkey King” as popularised by the 16th-century Chinese novel Journey to the West.
The PC Engine version of Taito‘s classic arcade game Rainbow Islands was only made available on CD-ROM, so you had to have a CD compatible PC Engine to play it.
[That was: until emulation was invented…] 🙂
Actually, Splash Lake is a PC Engine CD game, and was released in 1991 on CD-ROM only. Which is a pity because it’s so much fun to play – it deserves more attention.