Choose a puzzle to study parity, centre and edge cases across the 4x4, 5x5 and 6x6.
The two states a 4x4 reaches that a 3x3 cannot, 24 cases.
25 cases · 18.4 avg moves · 169 pro uses
The 5x5 reduction endgame: last two centres and edges, 29 cases.
31 cases · 9.2 avg moves · 60 pro uses
The 6x6 endgame: last two centres, edges and wing parity, 35 cases.
35 cases · 9.4 avg moves
