Waffle blocks like this Excellerations miniature waffle blocks set are popular building toys. They are flat and have matching pegs on their sides. You can assemble these pieces in 2D and 3D shapes, and in different positions.
Pieces of this set have an unusually big number of pegs on them – far more than pieces of Gakken and Plus Plus. The pieces have openings in them, so you can connect the pegs to the edges or the centres of the pieces.
All the pieces in this set are exactly the same in shape in form, with the color being the only difference. You can build many things from these pieces, given all the opportunities this set has. On the other hand, this set doesn’t have arches and other similar pieces, which somewhat limits the building possibilities. The houses are the things waffle blocks make best, and, sadly, there are no options for, say, cars with moving wheels.
This particular set has pieces that are 1.5 inches wide, so they are safe for small children to play with. These pieces are easy to hold and too big to swallow, so the manufacturer recommends them for kids who are 3 years or older.