brainteasers, puzzler, sodoku, kakuro, conundrums, riddles, trivia, crossword, simultaneous equations, crossword puzzle, tangram, quiz, cryptograms, sudoku, anagrams, quadratic equation, enigmatology, cruciverbalist, quandaries, whodunit, mysteries, enigmas, acrostics, bestiary, koan, differential calculus, booky, antidisestablishmentarianism, gameshow, mazes, boggling, palindromes, logarithms, ciphering, solvers, psychohistory, euclidean geometry, sleuth, gameboard, convolutions, erwin schrodinger, roguelike, dilemmas, lotr, unscrambling, scifi, dmc, syllogisms, paradox, lit crit, roleplaying, brainwork, theodicy, mathematics, clever clogs, bluffer, boolean algebra, pythagorean theorem, paradoxes, gamester, logicians, trilemma, chessmaster, haiku, engrossing, night watch, arithmetic, ninjutsu, bildungsroman, je ne sais quois, wabbit, ratiocination, metaphysics, rebus, wetware, mahjongg, shogi, gobbledegook, circumlocution, bottomfeeder, deciphering, tetris, metafiction, treasure hunt, inspector maigret, confounding, superstruct, esoterica, codebreakers, smartie, mot juste, farkle, novelisation, maths, asimov, swizz, turvy, olympiads, sophistries, newtonian mechanics, humdingers, seriocomedy