While ~530 to 800 collectively is kinda rough, levels 636 to 711 need to be reworked... with about 1000 tons of TNT.
- They are obnoxiously difficult in general
- Boosters do nothing most of the time due to mechanics blocking them
- Jelly Jars are FAR worse than the old mixer mechanic
- It is really hard to figure out the specific level mechanic you need to do
- They are generally exceptionally dull to play, again Jelly Jars are annoying and dull
- It is excessively hard to get a 5 streak going
- Win streaks are almost ineffective on some levels for the same reason as in 2.
Either they need a massive rework or just add 3-5 turns to every level. After 711 the game gets more like the early 500s then at 800 the game actually gets reasonable again.