Cosmic Cove 1
Advanced
0:00 - Intro cutscenes do not matter for practice (Koopa might be in a dodgy spot at 0:29 but nothing major)
0:18 - When shooting these Snoodles, be careful not to let the shell's headlights kill them first (this will spawn Star Bits instead of coins)
0:31 - For this shell grab, ground pounding just in front of the platform will pick up the shell as you enter the water. This is not particularly precise, but be careful not to undershoot/overshoot.
0:55 - If you are missing a coin by this point, go to the left at the end of the row of coins and grab the one in the bubble, then turn right and continue as normal.
1:00 - Holding Z as you grab the Comet Medal can make it easier to turn, but loses time to this method.
1:04 - For this jump out of the water, try not to be too far back. Throw the shell at the peak of the jump and either jump on the edge as seen in this example, or spin straight onto the switch, depending on what orks better for your positioning.
1:12 - Don't forget to feed the Hungry Luma in preperation for Cosmic Cove S.
1:31 - The movement here can vary a bit, but generally a combination of long jumps and spin-cancel single jumps are the fastest way to get to the waterfall.
1:37 - Initiate the first Wall Jump on the left-hand-side. This is to setup the crystal break strat.
1:42 - These inputs make the double crystal breal surprisingly consistent, and worth going for.
2P Notes
There is a much faster coin route for 2P Runners. See: 2P Cosmic Cove 1 Route
Everything beyond the 15th coin grab is the same as 1P.