Interlocking

Little Paperclip
Livecube
Livecube 3d Cross
Lock-N Cube
Lock-o-Box
Lock-Y Cube
Locked Cube I
Locking Cube
Logs & Sticks
LOL
Looped Nine
Loopy Cube
Love Cube
Lucifer's Friend
Lunatic
Luxemburr
Mambo
Marsh Marigold
Marzipan Puzzle