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Pro 3D foreground/background mechanic allows you to travel to different panes
The main gimmick of Kirby Triple Deluxe is that you can travel between the foreground and background by jumping on star transports. There are puzzles where you can manipulate something on one plane and have it affect the other, as well enemies that can attack from the other plane.
Con Doesn't diverge much from the classic Kirby formula
Other than the 3D foreground/background traveling mechanic the game is pretty much just straight Kirby with a couple new powers.