Tower Lab modules: Upgrade Costs & Unlock Guide

Tower Lab modules are research options that strengthen the module progression system in Tower Lab. Instead of directly increasing tower attack or defense, these labs improve the way you obtain, upgrade, reroll, merge, and recycle modules.

The system covers several resource loops:

• Module acquisition through common and rare boss drops
• Rerolling through additional reroll shards
• Module growth through lower shard and coin costs
• Module management through unmerging and shattering
• Effect targeting through bans for cannon, armor, generator, and core modules
• Assist progression through research that improves module-related effects

The most important planning rule is to separate short-term improvements from long-term account investments. Drop chance and daily mission research can help build your inventory, while cost reductions become more valuable after you regularly level modules.

The first important module research milestone arrives at Tier 4, Wave 70. This unlocks research for Common Drop Chance, Reroll Shards, and Daily Mission Shards. These three options form the foundation of the module economy.

The next major unlock point is Tier 10, Wave 40. It opens Module Shard Cost, Module Coin Cost, Rare Drop Chance, and the effect-ban labs. Unmerge Module is tied to Tier 8, Wave 20, while Shatter Shards requires the later milestone of Tier 16, Wave 40.

For most accounts, Reroll Shards and Daily Mission Shards are practical early priorities because they improve repeatable sources of module-related materials. Reroll Shards increase boss rewards, while Daily Mission Shards improve the value of completed daily missions.

Common Drop Chance is also useful, but its maximum improvement is comparatively narrow. It begins from a 2% common module drop chance and has 10 levels, reaching a total increase of 1 percentage point. This makes it a steady collection boost rather than a direct upgrade to module quality.

A useful priority framework is:

1. Improve the resource you spend most often.
2. Favor repeatable income before narrow probability increases.
3. Use research timers to keep the lab active.
4. Reassess priorities after unlocking Tier 10 research.

Module Shard Cost and Module Coin Cost both have 30 levels, with each level reducing the relevant upgrade cost by one percentage point. At maximum research, each lab provides a 30% reduction to its respective cost.

These labs have matching research timers and nearly matching coin prices. The main difference is the resource they reduce. Module Shard Cost affects the material requirement for increasing module levels, while Module Coin Cost reduces the coin requirement.

The first level of each cost lab requires a five-day-plus research timer and a cost of roughly 5 billion coins. Later levels rise sharply, eventually reaching costs measured in trillions. Because of this scaling, these labs work best as long-term investments rather than emergency purchases.

Choose the first cost lab by checking your upgrade screen:

• Pick Module Shard Cost when shards are limiting module levels.
• Pick Module Coin Cost when coins are limiting module levels.
• Keep both progressing over time if your account regularly upgrades several modules.
• Avoid delaying all other useful research for a cost reduction that will not pay back soon.

Advanced module labs provide more control over imperfect results. Unmerge Module is a one-level research option that allows modules to be unmerged. When a duplicate Epic or higher module was required for a merge, the system can return the lower-level module and the Epic component. In other cases, the conversion can provide shards of the unmerged type.

Effect bans work differently. They do not guarantee a desired effect. Instead, they remove selected effects from the reroll pool for a specific module category. This makes them more valuable when you already understand your target build and can identify effects that consistently waste reroll attempts.

Core Effect Bans offer the largest total number of bans, while Generator Effect Bans offer the smallest. Research costs and timers vary significantly between categories, so prioritize the module type that receives the most rerolls in your build.

Use this decision process:

• Need flexibility? Unlock Unmerge Module.
• Rerolling cannon or armor often? Consider the matching ban lab.
• Building around a core module? Core Effect Bans may have the greatest ceiling.
• Rerolling generators occasionally? Delay Generator Effect Bans until the investment fits your account.

Rare Drop Chance becomes available at Tier 10, Wave 40. It starts from a 0.5% rare module drop chance and has 10 levels for an additional 1 percentage point. This is a narrower investment than general shard income, but it becomes more attractive once your account can consistently use rare modules.

Shatter Shards is a late-game research path unlocked at Tier 16, Wave 40. It has five levels, with each level increasing shards earned from shattering modules by 20%. The maximum listed improvement is 100%. Its research timers are extremely long, so it should be planned around extended account progression rather than short-term needs.

Assist Module Main Effect / Substat Labs contain 30 levels. Each level adds 1% and reaches a 30% maximum. The research uses Q Coins, making it a specialized late-stage project for accounts already operating in that economy.