Worlds 4 and 7
To unlock worlds 4 and 7 you must complete castles 2 and 5 as Mini Mario. Specifics on world 4 are when you find the mini mushroom you must dodge a few more spiked balls and tken fight the boss. To beat the boss, you have to ground pound him when his head and 2 other circley parts are out of the ground. After like 3 hits, you will win. I haven't unlocked world 7 yet, so I'll have to get backto ya. I'm fighting boxing gloved ghots, so I might be a while.
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