Just so you know, when the game tells you "you unlocked X speed" in a mode it means you can restart from that speed in that mode, so you can restart from 900 after unlocking it for example. It still earns you the 1000 badge, so that may help.
You know The Meadow's track name is "Citalopram"? I searched on Wikipedia and it is indeed a medication in which "Overdosage may result in vomiting, sedation, disturbances in heart rhythm, dizziness, sweating, nausea, [and here are the symptoms in the game -->] tremor, and rarely amnesia, confusion, coma, or convulsions." That must have been what Jack was taking...
My suggestion is that you should use glue shooters (more than freezing towers) and set them to "strong". By doing so you will slow the bloons that are faster. I managed to win some hard games with this tactic.
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