The Ultimate Mathematical Challenge: Over 365 puzzles to test your wits and excite your mind

Week 17 (#ulink_aea928b7-5b87-559c-ad59-a9fafd0616a4)

Week 18 (#ulink_e6931345-6833-584d-aad2-5f4cc67619f4)

Shuttle Challenge 2 (#ulink_5a3f80bc-a13b-55a7-8304-8c1e99823445)

Week 19 (#ulink_010cfc41-2572-5a3d-a92d-8ce1835fd59b)

Week 20 (#ulink_19a98aee-cd88-54e4-bbdb-d9641a5a7cb7)

Crossnumber 5 (#ulink_e6194df0-214d-5efe-a993-ab52781073c8)

Week 21 (#ulink_8db2c308-021f-54c8-8416-a59b97770871)

Week 22 (#ulink_028880e9-7954-5ccf-9d0b-cd0006ef3411)

Logic Challenge 3 (#ulink_b6d3b590-4cd6-5277-9187-33b54e4000a5)

Week 23 (#ulink_be2a106b-aef2-57ed-bcf7-02038253c825)

Week 24 (#ulink_6bd00465-5c6d-5625-942d-0e62191b7326)

Crossnumber 6 (#ulink_84381195-b2bc-5cd0-a2f3-b7ca77afbad8)

Week 25 (#ulink_dda10365-e141-53ae-88d4-f0b72f18f7d0)

Week 26 (#ulink_47985789-f55f-51fe-b888-78322bb4c64b)

Shuttle Challenge 3 (#litres_trial_promo)

Week 27 (#litres_trial_promo)

Week 28 (#litres_trial_promo)

Crossnumber 7 (#litres_trial_promo)

Week 29 (#litres_trial_promo)

Week 30 (#litres_trial_promo)

Logic Challenge 4 (#litres_trial_promo)

Week 31 (#litres_trial_promo)

Week 32 (#litres_trial_promo)

Crossnumber 8 (#litres_trial_promo)

Week 33 (#litres_trial_promo)

Week 34 (#litres_trial_promo)

Shuttle Challenge 4 (#litres_trial_promo)

Week 35 (#litres_trial_promo)

Week 36 (#litres_trial_promo)

Crossnumber 9 (#litres_trial_promo)

Week 37 (#litres_trial_promo)

Week 38 (#litres_trial_promo)

Logic Challenge 5 (#litres_trial_promo)

Week 39 (#litres_trial_promo)

Week 40 (#litres_trial_promo)

Crossnumber 10 (#litres_trial_promo)

Week 41 (#litres_trial_promo)

Week 42 (#litres_trial_promo)

Logic Challenge 6 (#litres_trial_promo)

Week 43 (#litres_trial_promo)

Week 44 (#litres_trial_promo)

Crossnumber 11 (#litres_trial_promo)

Week 45 (#litres_trial_promo)

Week 46 (#litres_trial_promo)

Crossnumber 12 (#litres_trial_promo)

Week 47 (#litres_trial_promo)

Week 48 (#litres_trial_promo)

The Penultimate Challenge (#litres_trial_promo)

Week 49 (#litres_trial_promo)

Week 50 (#litres_trial_promo)