Chip's Challenge (PC)

Chip is willing to do anything for Melinda the Mental Marvel – more than anything, actually, because he wants to join Melinda's exclusive computer club the "Bit Busters". Melinda offers him membership, but on one condition: Chip must find his way from one end of Melinda's magical clubhouse to the other, picking up cosmic computer chips along the way.

Unused Tiles
Despite being a pretty used-content game, this does have unused tiles.

Not Used
Tile indexes, , and remain unused in the Windows version of Chip's Challenge. They appear to be copies of the used "invisible wall" tile (index ).