Cuboids are rectangular twisty puzzles with different side lengths: 1×2×3, 1×3×3, 2×2×3, 2×3×3 and other unusual formats.
They turn somewhat like a regular cube, but the unequal dimensions add their own constraints, tricks and sometimes a bit of shape-shifting.
Most cuboids are not official WCA puzzles, making them great for expanding your collection, trying non-standard puzzles and training logical thinking.