August 6, 2008
The game features plant enemies called Claws which come out of green pipes, therefore looking very similar to Piranha Plants.
Also most worlds end with a flagpole and a castle, referencing the level end in Super Mario games, and a ragdoll-like dinosaur, usually known as Greeter, comes out of it saying "I'm sorry, but the Princess is in another castle." parodying the Mushroom Retainer line "Thank you Mario! But our Princess in in another castle!"
Additionally the most common enemies in the game, called Monstars, bear some resamblance to Goombas, being very small with no body and being defeated by stomping them.
The creators of Braid didn't hold any right over Nintendo's Mario, but they only included subtle references to the series.