The track: squares with their doubles up to 15, then doubling, then Fibonacci. Beat a level to unlock the next — then keep climbing, all the way to 100²!
1
Doubles & Squares to 12
7 + 7 first, then 7 × 7 — the little double helps you remember the big square.
2
13 · 14 · 15
The big stretch — doubles first, then 169, 196, 225.
3
Doubling
Now keep doubling: 2 · 4 · 8 · 16 (that's 2×2×2×2!) and on up to 256.
🐚
Fibonacci
Add the last two to get the next: 1, 1, 2, 3, 5, 8, 13 … all the way to 144 — a square!
That's the track: squares with their doubles, then doubling, then Fibonacci. Below is the extra climb — 17² all the way to 100².
5
Trick of the Fours
17 · 18 · 19 — the ones digit × 4 shows the way!
6
The Top: 625
20 to 25 — the mirror 441, the 4·8·4, and the summit!