00573nam a2200157Ia 450000500170000000800410001702000220005808200180008010000200009824501170011826000280023530000100026394200070027399900190028095201160029920260205100622.0260111s9999||||xx |||||||||||||| ||und||  a978-1-4022-3857-4  a793.73  G921B  aGruber, Gary R. 0aWorld`s 200 hardest  brain teasers: Mind boggling puzzles, problems, and curious questions to sharpen your brain  aNapervillebSourcebooks  a188p.  cBK  c235501d235501  00104070aTSCSLbTSCSLd2026-02-05l1o793.73  G921Bp637155r2026-06-06 15:47:12s2026-05-11w2026-02-05yBK