Mega Bloks vs LEGO bases
LEGO Bases work with Mega Bloks, as the bricks are the same dimensions. However, certain Mega Bloks pieces, like specialized items and weapons, may not fit optimally with LEGO minifigures.

Certain bricks (including the maxi and DUPLO-sized bricks) are on a larger scale. They produce bricks that will work with DUPLO plates and such. This is probably the most produced size.