All premium upgrades, including Double Cash, Monkey Tycoon, Crystal Ball, Double Ranga, Explosive Darts, Frag Bombs, Digital Amplification, Dreadnaught, and Rank 31. With Rank 31 you will unlock all non-purchasable upgrades such as all tower types & all upgrades for them, all game modes such as Sandbox & Apopalypse Modes.
~ Official quote from Bloons Tower Defense 4.

Buy Everything is a Premium Upgrade featured in Bloons Tower Defense 4. It costs CoinsIcon100, and it unlocks every premium upgrade as well as advancing the purchaser to Rank 31 instantly.

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