Apprentice rank
Warming up — keep going.
Levels cleared
3+ – 5
Grid
4×4
Color difference
ΔE 4.5–6.2
How to climb
- The grid grows to 4×4 here. Move your eyes in a fixed pattern so no tile is skipped.
- Softer your gaze and let the odd tile “pop” — differences often show up in peripheral vision.
The next step: Mole
Clear 6 levels in one run to reach Mole. The color difference keeps shrinking — solid basics.