Bowser Memory M and Bowser Memory L

Block Mario and Luigi are encountered in Bowser's brain in Mario & Luigi RPG 3!!!. When the bros and Yellow Star gets to the brain, a strange creature scans the bros and creates badly made block versions of Mario and Luigi! They seem to have the personality of the Bros planted in them, as if they attack Block Luigi a few times, he'll hide offscreen.

One of Block Mario's attacks is consuming a blocky Super Mushroom and then jump to hit blocks above him, a reference to the classic breakable brick blocks. Once broken, debris from the blocks will fall on the Bros, who must counter by using their hammers. If the block is red, the debris will fall on Mario. If the block is green, the debris will fall on Luigi. After all three blocks are broken, a block-like Koopa will then touch Block Mario, causing him to shrink. Another attack causes a block-like Starman to appear while Block Mario or Block Luigi absorbs the Starman and try to ram the Bros. A single coin will show how the invincible Block Bro will attack. If the coin is on the ground, he'll do a ram. If the coin is in the air, he'll jump over the player. Block Luigi has his own special attack where he will be chased by a block-like Boo. Block Luigi will run in circles around Mario and Luigi while the Block Boo chases, and will only stop once a bro stomps the Block Boo. Block Luigi also has an attack where he grabs a hammer and then trips, sending it flying in an arc similiar to the hammers thrown by Hammer Mario. The bros must use their own hammers to deflect the attack.

Once one of the two blocky bros was defeated, their brother picked up a block-like 1up Mushroom to revive them and bring them back into the battle. Unfortunatly, the Block Bros were still no match for the real Mario and Luigi.