also Puzzler
Acrostic, Baffle, Bemuse, Bewilder, Brainteaser, Chinese, Confuse, Conundrum, Crossword, Crux, crux medicorum, Egma, Elude, Enigma, Fox, get, Glaik, Gravel, Intrigue, Jigsaw, kakuro, Kittle, Logogriph, Magic pyramid, Mind-bender, Monkey, Mystify, Nonplus, Perplex, Ponder, Pose(r), Rebus, Riddle, Rubik's CubeĀ®, Sorites, Sphinx, Stick(l)er, Stump, sudoku, Tangram, Teaser, thematic, Tickler, Wordsearch, Wordsquare