Lego Braille Bricks

https://braillebricks.com/
The Lego BrailleBricks is a set of blocks where some of the studs on the top (normally there are eight) have been omitted in order to conjure up a different Braille sign on each block. In this way, Lego blocks help to become familiar with Braille in a playful way.
The website of ‘The Braille program’ offers a lot of practical material that you can get started with right away.
They are available from the Braille League and for the Netherlands from Bartiméus.