Filters
W-Frame - Koichi Miura
Key Lock Puzzle - Osanori Yamamoto
Open Frame - Lucie Pauwels
Stop-Puzzle - Vladimir Krasnoukov
Antislide-Tetramino (AT Puzzle) - Vladimir Krasnoukov
Anti-Depressant - Taus Brock-Nannestad
Tetra 3D Lock 1 & 2 - Osanori Yamamoto
Black & White Antislide - Dr. Volker Latussek