999 star bits
On toy time galaxy, on the first level, heavy metal mecha bowser, after the second or third checkpoint go to the left, you must be spring mario, go in the pipe and get to the top, try not to break any of the blocks, at the top there is a question mark coin, get the coin and all the blocks will turn into star bits. If you didn't break any blocks there should be 61 star bits. Then go through the pipe and jump toward yourself and if your lucky you will land on a red block with a 1-up mushroom then jump off and do it until you have 999 star bits. You can only have 999 star bits in a level but on the observatory you can have way more.
I have only done this three times and I have 4660 star bits.
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