12
strawberry +2 per wave
13
14
oranges +2 per kill. One of the best money upgrades.
15
125
125
16
peppers, 125 coins now and nothing later on. only good during the last 2-3 waves when other upgrades don't have enough time to make more money.
17
18
turnips, lose 100 coins now (lose 1 tower), but at least it returns money quickly with the +2 per kill.
19
20
carrots, market value, likely an underestimate, don't know exact likelihood market stuff shows up since you make more money on lvl2 and lvl3 towers and affects the benefit of this upgrade
21
negative 10
120
22
Radish, upgrades a random tower and disables it for one wave. A pretty weak upgrade, to be honest. Most of your towers should be lvl 1 so you can consistently sell all three market chances, and even if radish upgrades one of your lvl 4 towers that means it's disabled that wave and may make it hard to defend, especially during a boss wave.
23
24
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