a few notes for anyone playing this game:
each mode has 4 main stages: breakfast, lunch, dinner, dessert
each level has 3 bonus items; if you collect all items in a stage, you'll play a bonus stage.
the bonus stages are, respectively: brunch, quick snack 1, quick snack 2, after midnight.
each bonus stage also has bonus items, but they're only relevant for your score.
this means each game has 4 stages, with potentially up to 4 additional bonus stages, for a total of 8 stages overall
you can press spacebar to attack, and have a limited number of attacks.
you can easily play a full game without ever using the attack button, but while rare it is possible to encounter a set where all 4 lanes are blocked by jawbreakers/mooncheese.
however, the attack only works on mooncheese and nothing else, so keep that in mind.
the "iron fist" and "vanishing" achievements are possible, but only on your first ever attempt:
for some reason, once you've eaten a jawbreaker or mooncheese, the game permanently saves as "having eaten one", so the only way to get the achievements if you can't do it in your first sitting is to entirely erase all your save-data before attempting it.
this is easily accessible if you're playing the game using newgrounds player, which saves your data locally on your pc.
for iron fist, either hard or expert mode probably work, but i can confirm it works on hard mode.
for vanishing, the order in which the 3 modes are played seems irrelevant (i've played hard, then easy, then expert); you also only need to clear the main 4 stages, so aside from dodging mooncheese (and additionally jawbreakers), it's also recommended to avoid bonus items if possible so you need to play as few total stages as possible.
in regards to bonus items:
every level has 3 unique bonus items. they're different between levels, but each specific level has its own fixed items;
for example, breakfast's bonus items are always apple, grape, bacon.
they will appear during the level in a random order (so having an empty space while collecting them doesn't necessarily mean one was missed yet)
however, there's a few bugs in regards to these:
- brunch's bonus items are apple, grape, bag. however, in level you'll get apple, pinapple, box. this is the only level with different bonus items than the ones listed.
- the brunch and after midnight bonus levels are unavailable in easy mode; even if you collect all bonus items, those levels will be skipped.
- on expert mode, the second bonus item (pineapple) during bonus 2 (quick snack 1) will never appear in-game. thus, the "bonus muncher" achievement (and consequently its respective medal) is impossible to obtain.
since it requires to get "every bonus item in-game", i'm not sure if it's only because of the missing item in expert mode, or also because of the two unavailable stages in easy mode. either way, it's unachievable