To beat Cardio Canyon on Heroic difficulty in Fieldrunners 2 for iPad for iPad without selling towers, calling airstrikes, or using consumable items, invest your starting cash into upgraded corner Gatling Towers, then build a concentrated kill zone using Glue Towers paired with Rocket and Spark coverage.
Because a no-sell restriction eliminates refund cash, every tower placed must stay in position for all 17 minutes of the run.
Recommended Tower Loadout
A no-item, no-sell run requires a self-sufficient loadout that answers fast runners, dense swarms, heavy armor, and air waves without emergency interventions:
- Gatling Tower: Serves as the early-game anchor and provides cost-effective single-target damage against scouts and flyers.
- Glue Tower: Slows lead targets to compress separated units into tight clusters for splash weapons.
- Rocket Tower: Delivers long-range area-of-effect damage across intersecting track bends.
- Spark Tower: Deals heavy, sustained burst damage to melt armored boss vehicles and high-health tanks.
Early-Game Setup and Cash Management
Do not scatter level 1 towers across the canyon path. Building multiple un-upgraded towers spreads your damage too thin and leaks fast runners.
- Place an initial Gatling Tower on the inside pivot corner of the first major canyon bend. This placement ensures the tower tracks targets entering the turn, navigating the apex, and exiting down the straightaway.
- Upgrade the anchor Gatling Tower directly to level 2, then level 3, before placing additional towers. A single level 3 Gatling Tower clears early infantry waves faster and more reliably than three separate level 1 towers.
- Save surplus gold as early waves clear so you can afford crowd control before armored units arrive.
Chokepoint Construction and Mid-Game Upgrades
Heroic wave density quickly outpaces single-target Gatling fire. Transition into a clustered kill box at the primary intersection:
- Deploy a Glue Tower just ahead of the turn entering your main firing lane. Snaring lead units forces incoming waves to bunch together.
- Place a Rocket Tower behind your primary line. The extended range allows it to fire continuously over canyon walls into the slowed enemy cluster.
- Upgrade existing towers to tier 3 before expanding outward. In a no-sell run, low-tier towers waste tile space and fail to penetrate high-tier armor scaling.
| Tower Type | Target Priority | Placement Rule |
|---|---|---|
| Tier-3 Gatling | Fast runners, shields, flyers | Inside corners with overlapping straightaway line of sight |
| Tier-2/3 Glue | Lead ground units | Pre-bend entrance to compress incoming waves |
| Tier-3 Rocket | Clustered swarms, light armor | Recessed tiles covering multiple track segments |
| Spark Tower | Heavily armored tanks | Core kill zone adjacent to active Glue coverage |
Securing Air Defense and the Final Waves
Late waves introduce high-speed air units and armored convoys. Because aerial units ignore ground track curves, clear lines of sight are essential:
- Anchor anti-air coverage by positioning tier-3 Gatling Towers and Rocket Towers with unobstructed visibility across the central flight path.
- Add a Spark Tower in the center of your primary slow zone to burn through high-health tanks before they reach the straightaway toward the exit.
- Place a secondary splash tower near the final stretch only after your central kill zone is fully maxed out, providing a reliable safety net to finish off surviving stragglers.
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Player Comments
76 players commented on this guide.
The explanation is clear, especially for beginners.
Good guide for Fieldrunners 2 for iPad players. The early game part was useful.
The tips are practical and easy to follow.
This helped me understand early game much better.