Wobmat Math Challenge · Explorer
Explorer Book 2River Run
Explorer Book 2: River Run — 500 Olympiad-Style Maths Puzzles for Grades 3–4 (Ages 8–10) with Full Solutions
Coming soon
Planned publication: November 2026. Leave your email and we'll tell you when it's out.
Dig deeper! Join Wobmat the wombat explorer and his friends on 25 maths adventures along the River Run.
The Wobmat Math Challenge is a puzzle series for curious children who love a challenge. Every adventure is a 20-question contest in the multiple-choice style of international primary maths competitions: 7 warm-ups (3 points), 7 trickier puzzles (4 points) and 6 brain-stretchers (5 points).
Inside Book 2:
• 500 brand-new puzzles, all different, with five answer choices each
• Logic, number sense, patterns, shapes and area, cubes and nets, counting, time, money and more
• 221 puzzles with pictures: cube buildings, dice, paper folding, clocks, maps, number walls
• A short, child-friendly solution for every puzzle
• Answer sheet, progress tracker and Bronze, Silver and Gold Explorer badges
Book 2 is one step up from Book 1. The four Explorer books climb step by step, so a child can grow from their first contest puzzle to the hardest questions for grades 3–4.
Great for maths-contest practice, gifted-and-talented enrichment, maths clubs and holiday brain training. No calculator needed — just a pencil and some patience.
Companion series: Dig Deeper with Wobmat teaches the ideas behind these puzzles in full-colour comic Guides with matching Practice books (Grades 3–4).
Details
- ISBN
- 978-91-90286-17-3
- Pages
- 130
- Grade
- Grades 3–4 (Ages 8–10)
- Language
- English
- Format
- Paperback, 8 × 10 in (20.3 × 25.4 cm)
- Interior
- Black and white
- Publisher
- Usinee (PBL Partners AB)
- Author
- Payam Haerifar