According to the back cover, Splat! is a prototype arcade game which was never released before.
This collection has the fastest Spy Hunter emulation of any emulator. Jeff Vavasour, the lead programmer, correctly realised that unchanging sound effects and music don't need to be emulated in realtime along with the rest of the machine. So he "pre-emulated" the Motorola 68000 Spy Hunter used for music and generated .wav files of the sound; he then plays those .wav files back while the emulator is running. Without an additional 68000 to emulate, the game runs perfectly on a low-end Pentium.