You can clear Season 2 Level 15 in Battle Strategy: Tower Defense without spending resources on bullet upgrades by focusing entirely on standard tower stat increases and clustering your defenses around the primary track bends. Standard upgrades provide raw damage, attack speed, and range improvements at a predictable cost, ensuring your economy never stalls when armored units and dense waves appear.
Chokepoint Placement
Do not scatter towers evenly along the path. Dispersing your turrets weakens overall focus fire and allows fast runners to escape before sustaining lethal damage.
- Anchor the sharpest corner: Place your primary single-target and rapid-fire towers directly adjacent to the sharpest bend on the track. This maximizes the time targets spend inside their firing radius.
- Overlap firing cones: Build secondary towers immediately behind the frontline anchors so their attack ranges intersect across the bend.
- Keep sightlines open: Position units clear of any environmental obstructions that restrict their field of view.
Upgrade Priority by Wave Phase
Concentrating funds into a few high-tier towers is more effective than deploying multiple un-upgraded base turrets. Follow this progression to keep pace with escalating enemy health pools:
| Phase | Defensive Objective | Recommended Action |
|---|---|---|
| Early Waves (1–5) | Eliminate introductory runners and build economy | Deploy physical baseline towers; prioritize attack speed upgrades first |
| Mid Waves (6–10) | Handle split paths and strip light armor | Advance anchor towers to high standard tiers; add area-of-effect splash coverage |
| Late Waves (11+) | Defeat heavy vehicles and sustain boss damage | Maximize damage and range tiers on primary chokepoint anchors |
Handling Swarms and Armored Targets
Without specialty elemental or status-inflicting bullets, you must separate crowds from heavy units mechanically:
- Thin out light swarms first: Place standard area-of-effect towers slightly ahead of your main chokepoint. These splash turrets destroy low-health infantry groups before they enter the corner, preventing them from absorbing shots meant for durable targets.
- Focus down heavy armor: Direct high-damage single-target towers to hit heavy vehicles as they round the bend. If the game interface permits target priority switching, set these towers to focus on the strongest enemies.
- Extend coverage for surviving tanks: If an armored unit or boss survives the central intersection, purchase standard range upgrades on downstream towers along the exit lane to maintain continuous damage until the unit falls.
Late-Wave Resource Management
During the final waves, avoid panic-buying new, un-upgraded towers near your base exit. Base-level units deal negligible damage against endgame armor and drain funds needed for decisive stat boosts. Instead, direct all remaining stage income into completing the highest standard upgrade tiers on your core chokepoint batteries, where high stat multipliers provide the output needed to close the level.
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Player Comments
97 players commented on this guide.
This guide answered the exact question I had.
The explanation is clear, especially for beginners.
This saved me time in the early game.
Good guide for Battle Strategy: Tower Defense players. The strategy part was useful.