El33Tonline:
Unlocking ancillary content in a game (alternate costumes, superfluous characters and items, and maybe even the odd vehicle or map here and there), while naturally progressing through that game, is perfectly acceptable. Unlocking the game itself (the core content through which you would normally play in any other game) through extended play of a not fun, apparently meta experience of sorts, however, is unacceptable.
Behold the true best of the best. Jordan Ramée has played through every mini-game in every Mario Party. Here's his list of the top 10.
A Mario Party Series Retrospective: Road to Star Rush: Where can the series go? Where has it already gone? Let's see if we can shed some light on this!
Mario Party Legacy highlights the Magic Lamp from the Mario Party series!