数学技巧：心算训练

2026年10月21日

v3.71 Expanded game statistics
v3.65 Updated daily streak chart; added streak protection for missed days
v3.64 Cloud progress saving
v3.63 Fixed alarm bug
v3.61 Optimization and reduced app size
v3.59 Font size, exit confirmation, and new color palette
v3.58 New themes: Aurora, Neon, Aura Dark/Light
v3.52 Step-by-step example solutions