Other matters arising from the NL equivalent of the challenge:
* Crazy 8 (KEEP ON TRUCKING) was solved with just builders+bashers in NL, but hasn't been confirmed in DOS yet.
* Taxing 2 (Watch out, there's traps about) has several more 2-type solutions in NL, in addition to the blockers+builders already noted. Bombers+builders won't work in DOS because timed bombers can't explode early enough, but the others should work.
* Mayhem 22 (A BeastII of a Level): namida found a bombers+builders solution in NL, not confirmed in DOS yet.
* Taxing 28 (POOR WEE CREATURES): I found a floaters+bombers+builders+bashers solution in addition to the already reported 4-type solution; it should work in DOS too. It's even possible the bomber might be dropped with some RR fiddling.
Also, Wild 15 was incorrectly filled in with Wicked 15's result, and this had apparently gone unnoticed for years and might have remained there for ever were it not for our NL investigations