If you are talking about invalid combinations in MS, no. Putting a wall under an object has an identical effect only to Chip. Monsters and blocks only react to the tile on the upper layer, so if the combination is, say, red key on wall, a monster can step onto the space, erasing the wall in the process.
CCMiniLP, my CCLP1 submissions. Outdated, not recommended.
CCSignificantlyLargerLP, my CCLP4 submissions. More current than my main set.
Consistent Inconsistency (ongoing), my main CC1 custom set. (discussion)
RyanJ1.dat (ongoing), my main CC2 custom set. (discussion)
Mystery Project™ (unfinished) (previews)
YouTube | Twitch | Steam
CCSignificantlyLargerLP, my CCLP4 submissions. More current than my main set.
Consistent Inconsistency (ongoing), my main CC1 custom set. (discussion)
RyanJ1.dat (ongoing), my main CC2 custom set. (discussion)
Mystery Project™ (unfinished) (previews)
YouTube | Twitch | Steam