Bloons TD 4 Walkthrough — Beating All 75 Rounds

Every track on iOS runs to 75 rounds (official). There is no official walkthrough, so this page collects the player-convention path that works across most tracks — the same shape carries first-run, intermediate and advanced play. No invented costs or numbers.

The walkthrough shape

1. Opening — one tower. Place a single damage tower at the first bend and spend the first rounds upgrading it just enough to hold. (community knowledge)
2. Early farm. Drop a Banana Farm as soon as your line is safe. Every round it earns more than it cost, and that compounding wins the game. (community knowledge)
3. Mid-game — upgrade, then add. Push your main damage tower through its upgrades before buying a second copy. Coverage gaps: add a second tower only where bloons leak. (community knowledge)
4. Late game — consolidate into Sun God. Save toward the super-tower, and keep a Spike Factory at the end as insurance. This is the classic finish for the final stretch. (community knowledge)
5. Round 75 and beyond. Beat the last round, then decide: start the next track or keep going in freeplay. (community knowledge)

How each mode plays

• Challenge Mode

  Official: Confirmed in the official iOS app description — mode with unique gameplay elements added in update 2.0.

  How to play (community knowledge): Player convention: expect restrictions or twists each attempt, so lean on the two things that transfer everywhere — an early farm and one strong upgraded damage tower.

• Freeplay

  Official: Continue beyond the final round and survive as long as possible (official iOS description).

  How to play (community knowledge): Player convention: keep converting income into Sun Gods and Spike Factory layers; the game keeps ramping, so keep consolidating, not spreading.

• Apopalypse Mode

  Official: Added in iOS update 1.4 — a pressure variant (official iOS description).

  How to play (community knowledge): Player convention: upgrade earlier than feels comfortable, because the pace does not give you time to save up later.

• Deflation Mode

  Official: Added in iOS update 1.6 (official iOS description).

  How to play (community knowledge): Player convention: income is capped or scarce, so one efficient damage tower upgraded steadily beats many cheap ones.

Where to go from here

For the towers that carry this walkthrough, see the best-towers priority list. For the strategy behind it, start at the beginner guide.

Official facts: Apple App Store description for Bloons TD 4 (v3.6.2) — https://apps.apple.com/us/app/bloons-td-4/id404553553 . Play conventions: community knowledge, labeled as such on every step.