Collidascope was maybe never intended to be a 16-bit Windows game, the FILE-ID.DIZ of version 1.1 states Windows 95, 98 or NT as the system requirements. But it does run in Windows 3.1, without Win32s. It was created with Corel's Click & Create, a spin-off of the well-known Klik & Play, which was itself a 32-bit application but obviously compiled 16-bit games.