Number Challenges — medium

Medium sequences combine rules. A series might multiply by 2 on even steps and subtract 5 on odd steps, or follow a Fibonacci-style recurrence where each term depends on the two before it. The jump from easy is not about harder arithmetic — it is about holding two ideas in your head at once.

Build a short checklist and run it in order: differences, ratios, parity, digit sum. Most medium puzzles fall to one of those four checks. If a puzzle gives you grouped numbers or a grid, compare rows and columns independently. You are often looking for conservation rules — fixed totals, mirrored gaps, or repeated remainders.

This is a good level to try Timed Trial mode. The countdown pushes you to test patterns systematically instead of guessing. If you run out of time, switch back to Classic, use a hint, and restart the reasoning from scratch. That habit matters more than the score.

Write small labels above each term: d1, d2 for first differences, r3 for remainder mod 3. That sounds tedious, but when two candidate rules both look plausible, visible notes are what keep you from chasing a dead end for five minutes. If this level feels tight, the easy set makes a good warm-up.