Thanx Wally but this was a multi-level puzzle game where you had to shunt diamonds together to collect, whilst avoiding monsters. There were also cannon ball type things which you had to move out of the way but if you moved 2 together then they were then immovable. There were also keys to unlock doors to get into other sections plus holes to manoeuvre round.
Hope this is a bit more specific and hope someone knows it.
Does anyone know if it's available to play on Windows 2000?