Akadia is a multi challenge puzzle designed and made by Vinco of the Czech Republic.
There are eight wooden cube pieces that have holes and pegs on them and all fit together to make a cube. Each piece is individually marked with a letter, this is handy for identifying them but not much help in solving.
You can use different numbes of pieces to try and create different shapes. For example there are some simpler challenges using four pieces or much harder challenges using all eight.
This is the large version which measures 95 x 95 x 95mm.