Bloons: Unlimited

Bloons: Unlimited is the seventh game in the Bloons TD series, and the game that merged Bloons Chapter 4 (2014) and Bloons TD Zeta (2015). It was released on November 29, 2017.

Gameplay
In Arcade Mode, you play like Bloons Chapter 4, with one major change; You can purchase upgrades for your dart, there are 5 paths; Power, Abilities, Sharpness, Amount and Special.

In TD mode, you play with towers that have 4 paths+6 upgrades/path, of which you can use up to three at once.

Your towers have health, which is increased or decreased depending on:

Tower damage

Upgrades

Type of Tower

Also, bloons can damage towers, thae amount depends on the type of bloon and the damage it has.

There are 8 difficulties; Easy, Normal, Hard, Killer, Dominius, Impoppable, Shadowdrift and Apocalypse. (Apoc mode is now the hardest difficulty. (You get: 200, 150, 100, 50 lives + 10% more tower damage, 25 lives + 20% more tower damage + 5% more powerful bloons + 10% faster bloons, 20 lives + 5% less money + 30% more tower damage + 10% more powerful bloons + 15% faster bloons + 5% more rounds, 15 lives + no gap between rounds + 10% less money + 50% more tower damage + 20% more powerful bloons + 10% more rounds + 25% faster bloons + blimps start 10 rounds earlier + 50% more cost.

Sandbox also exists, and Deflation starts you in round 24 to 45 with $12,000 to $37,000 (depending on difficulty)

Towers (TD mode)
All towers in BTD5 plus: Monkey Tank (inital cost 500 to 750) COBRA (init. cost $1000 to $1500) and Monkey Corps (init. cost $600 to $900)