Four is Death

Can you survive 44 rounds of nothing but Assassin Bloons on Round the Bend Hard Difficulty? You only have 44 lives, but that doesn't matter, because you will return to the west if one bloon escapes! (Explanation of the "return to the west" thing on TVTropes.)

Rounds
Same as in a regular BTD6 game, but with every bloon being an Assassin Bloon! Bloons that are normally Assassin Bloons are now Camo Bloons, too (Deadly combination, desu!).

Trivia

 * The number 4 is, in a lot of Eastern countries (especially the Koreas, China, and Japan), treated like 13 in Western countries.