Don't let the discourse on whether this game innovated enough compared to the first game distract you from the fact that it doesn't improve on anything from Galaxy 1 and is essentially glorified dlc. Not a bad game by any means, don't get me wrong, not a dull moment and all that but it did start the era of boring, linear, blend together era of mario games that hit a boiling point with 3d world and new soup U. Worth a playthrough nonetheless, unless you're one of those people that are crazy enough to 100% any game; only the most dedicated do that willingly and 100%ing this game is considered an abstract form of torture in foreign countries. Forcing prisoners of war to get all the prankster comets could make anyone snitch on where Osama Bin Laden was hiding, hell if it was me i'd rather get waterboarded.