Blending World
Building World.png
First appearance Mario's Early Years! Fun with Letters (1993)

Blending World, known in the Super Nintendo Entertainment System version as Building World, is a world in Mario's Early Years! Fun with Letters. It is one of the ten (seven on SNES) islands in the game and is represented by a jigsaw puzzle in a frame, depicting a red crayon and the letters "re" and "d".

In the PC version, Blending World takes place in an area of blue blocks with gradients, and a red background that is similarly blocky with gradients. In the SNES version, Building World instead takes place in an area of pipes and a blue background of puzzle pieces.

The player will be given the command to find the block that contains the required word sound. These fit into a 2x2 jigsaw puzzle; when the player completes said puzzle, they can proceed to the next level. The third level requires the player to complete the word shown. When the correct answer is given, a random character or creature pops out of the scenery praising the player.