Here's a video of the Super Mario Bros 3 proof-of-concept created by the founders of id Software to sell Nintendo on the idea of porting the game to PC. Uplo...
The description says it was originally uploaded by John Romero. Not far in, you can see him kick the turtle shell into the block to get the power-up. It was not his first time playing the game. He seems to be showing how closely they replicated the functionality of SMB3 on the NES but in DOS, which was very impressive at the time and eventually became Commander Keen when they didn’t get the contract.
The description says it was originally uploaded by John Romero. Not far in, you can see him kick the turtle shell into the block to get the power-up. It was not his first time playing the game. He seems to be showing how closely they replicated the functionality of SMB3 on the NES but in DOS, which was very impressive at the time and eventually became Commander Keen when they didn’t get the contract.