Upgrades

Q: How are upgrades calculated?

All upgrades, with a few exceptions (mentioned below), are multiplicative. What this means is that the formula works like this: $$Base Value * Upgrade 1 * Upgrade 2 * Upgrade 3, etc. $$

Some upgrades that are calculated additively, meaning the formula works like this: $$Base Value + Upgrade 1 + Upgrade 2 + Upgrade 3, etc. $$

The only upgrades that are calculated additively are the following:
 * 1) Crit Hit Chance
 * 2) Spell Duration
 * 3) EXP Base Drop
 * 4) Gold Base Drop
 * 5) 2x Gold Chance %
 * 6) Boss Essence Drop
 * 7) 2x Boss Essence Drop Chance %
 * 8) 3x Wave Essence Drop Chance %
 * 9) Resource Hauler Essence Drop
 * 10) Rarer Monsters Chance %
 * 11) Tech Ship Base Scroll Drop
 * 12) Mission Gems
 * 13) Game Speed %
 * 14) Djinn skill power

Q: What's the highest level for upgrade [X]?

Refer to the following list/spreadsheet for detailed info on all upgrades of the game:

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