Stack blocks on top of each other. It will take a small space as a tower in the corner or wall against the wall.
The only difference is in size.
XL is 60% from XXL block size.
XXL are 7.87x3.94x3.94in (20x10x10cm).
XL are 5.11x2.56x2.56in (13x6.5x6.5cm).
INTERNATIONAL PLAYDATE DAY IS ARROUND THE CORNER