To get a mushroom house to appear in multiplayer, you simply need to clear the level when the time has the same 2 end digits next to each other when you touch the flag pole. Examples: 544, 322, 411. Depending on the two end digits, you will make different mushroom houses appear at the start point, as you would in single player when you save a Toad, only the digits are mostly red mushroom houses. Two zeros at the end will get you nothing. When you do this, you hear the original Super Mario Bros. level clear music and see a number of fireworks depending on what the last 2 digits are. 1 firework for 11, 2 for 22, and so on.

Unlockable	How to Unlock
Gold Mushroom House	Touch the flagpole with last 2 time digits as 99.
Green Mushroom House	Touch the flagpole with last 2 time digits as 11 or 22 at the end.
Red Mushroom House	Touch the flagpole with last 2 time digits as 33, 44, 55, 66, 77, or 88.