Super Mario Sunshine
Mario must clean up lots of sludge and filth that is on the island. F.L.U.D.D. allows him to do this. F.L.U.D.D. can only hold a little bit of water and Mario must jump into a pool of water after the water runs out to refill it. F.L.U.D.D. can also do several other things. If Mario aims the nozzles down, Mario can float for a few seconds until the water pressure runs out. There are also areas where Mario takes F.L.U.D.D. off and jumps around himself without assistance.