Carrot Tower Defense Upgrade Paths

Many bunny towers in Carrot Tower Defense split into two upgrade paths at mid-tier — a design choice that lets one unit fill different tactical roles without summoning alternates. Choosing fast attack speed versus heavy damage, or support buff versus debuff, permanently shapes that tower instance for the rest of the match. This guide explains dual-path mechanics, documents confirmed split units, and recommends paths for normal mode, boss waves, and Extreme Mode's zero-leak requirement.

How Dual Upgrade Paths Work

Place a bunny on a valid tile and spend in-match carrots on sequential upgrades. At a branching tier, the UI presents Path A and Path B — mutually exclusive for that tower instance. Further upgrades deepen the chosen branch; you cannot merge paths mid-match. Selling and replacing may refund partial carrots depending on current game rules, but path resets are costly — plan before clicking.

Not every unit branches. Starters like Sniper Bunny and many rare units use linear trees. Check the all units list for which bunnies split; currently Bonker Bunny is the flagship dual-path example in published data, with Steve Herz and Nerd Rabbit offering path-dependent behavior described in their ability text.

Bonker Bunny: Fast Path vs. Strong Path

Bonker Bunny is the tutorial melee DPS every account owns. Its two paths define early-game skill expression:

• Bonker Bunny: Fast Path — higher attack speed · Strong Path — higher damage per hit

Fast Path — Higher Attack Speed

Fast Path increases bonk frequency, excelling against swarms of low-HP nibblers and chip damage on fast units like Cheeky Wheelers documented on special enemies. Place Bonker on sharp corners where nibblers stack briefly — each pass triggers more hits. Fast Path underperforms against high-HP bosses such as Gloster unless you have backup Sniper or Magician DPS from the tier list.

Recommended when: early waves 1–15, maps with dense spawn intervals, or when you lack AoE and need chip cleanup on weak adds.

Strong Path — Higher Damage Per Hit

Strong Path trades speed for bonk power, ideal versus tanky nibblers and armored variants that absorb many small hits. Boss segments benefit when Bonker sits on a long corner segment with extended contact time. Strong Path clears slower swarms — pair with Boom Rabbit or Carrot Magician AoE so small nibblers do not leak past.

Recommended when: mid-game boss approach, Muncher-style high HP targets, or when Sniper Bunny already covers swarm control on straightaways.

Path Commitment Rules

Treat path choice as permanent for that placement unless you sell the tower. In Extreme Mode, a wrong-path Bonker on a critical tile can cost the entire 40-wave run at 1 HP — see Extreme Mode guide. Scout the map during wave 1–2: identify choke corners (often fast path) versus single-file tank lanes (strong path).

Co-op or future modes may add respec items; verify on latest update after patches. Default assumption: no free respec.

Other Path-Dependent Units

Nerd Rabbit (Support)

Nerd Rabbit branches between ally buffs and enemy debuffs depending on upgrade selection. Buff paths amplify nearby DPS like Carrot Magician or Ninja Rabbit; debuff paths soften bosses and elite nibblers for the team. Place Nerds centrally when buffing; near front lines when debuffing high-priority targets. A-tier support in most comps — details on units page.

Steve Herz (Hybrid)

Steve Herz offers flexible path-dependent abilities suited to mixed teams when you lack a dedicated S-tier. Experiment per map: Woodlands bends favor AoE-adjacent paths while Deep Tunnels straights favor single-target branches. Compare outcomes with the unit comparison tool.

Upgrade Order Before Path Split

Maximize pre-branch tiers when carrots allow — base stat gains apply before the fork multiplies them. Economy first: ensure Farmer Bunny is online so upgrade income keeps pace with waves. The early game build suggests first three upgrades on damage dealers before luxury splits on secondary tiles.

1. Place Bonker on best corner, Sniper on longest straight.
2. Add Farmer Bunny by wave 3–5.
3. Upgrade to branch threshold, pause, read upcoming wave types.
4. Commit path before boss or carrier wave — boss guide.

Map-Specific Path Recommendations

Deep Tunnels: Mixed paths — fast Bonker on tight corners near spawn, strong Bonker mid-tunnel if tank waves cluster. Goo Rabbit patches reduce pressure either way — Deep Tunnels guide.

Woodlands: Fast path often wins on winding routes with frequent re-entries into melee range; AoE towers handle clumps — Woodlands page.

Dual Paths vs. Summoning New Units

Paths let one bunny mimic two roles cheaply, but they never fully replace dedicated S-tier summons. A strong-path Bonker does not replace Ninja Rabbit pierce or Goo Rabbit slow. Allocate lobby carrots toward summons per the summon guide while using in-match carrots to optimize paths on units you already own.

Extreme Mode Path Discipline

Extreme rewards conservative strong-path Bonkers on the final choke before the base combined with Goo slow and Ninja pierce. Fast path only on secondary tiles where leaks are impossible. Full team templates: Extreme build guide. One mis-path on the primary choke ends the 500-carrot attempt instantly.

Summary Checklist

• Identify wave type before branching — swarm (fast) vs. tank (strong).
• Do not split every Bonker the same way — vary by tile role.
• Support paths (Nerd Rabbit) follow team composition, not solo habit.
• Re-read patch notes — new units may add third paths or respec items.

For roster-wide priorities beyond path clicks, return to the unit tier list and noob to pro progression guide. Upgrade paths reward planning; summons reward patience — both layers define Carrot TD mastery.