To unlock Creative mode, take the test on two different days.

ACHIEVEMENT - HOW TO UNLOCK
First Touch (5 points) - Complete a Daily Test.
Combo (10 points) - Get 30 combos in any mode.
A+ (10 points) - Get an A+ in the Training modes.
Brain Master (30 points) - Get an A+ in all mini-games.
20% Brain Usage (15 points) - Reach 20% Brain Usage.
40% Brain Usage (15 points) - Reach 40% Brain Usage.
60% Brain Usage (15 points) - Reach 60% Brain Usage.
80% Brain Usage (20 points) - Reach 80% Brain Usage.
100% Brain Usage (20 points) - Reach 100% Brain Usage.
Online. (10 points) - Complete an online match.
Brain Lord. (20 points) - Win 10 online matches in a row.
The One. (30 points) - Win a total of 100 online matches.