Namco Museum Vol.3 for PlayStation was released on June 21, 1996 in Japan.
Two unique versions of The Tower of Druaga are also hidden. One is called "Another Tower", and the other is called "Darkness Tower". Both are harder than the original and require different methods to beat the game.
[JP] "Namco Museum Vol.3 [Model SLPS-91160]" (PlayStation the Best, 1999)
[US] "Namco Museum Vol.3 [Model SLUS-00398]
[EU] "Namco Museum Vol.3 [Model SCES-00268]