Upgrade Deep or Build Wide
The same money can max one tower or build three basic ones.
- Prototype complexity
- Who plays
- Solo decisions
- Design focus
- Economy · Spatial · Optimization
No.089Kingdom Rush01The core loop
Action → feedback → next choice- 01Assess current coverage
- 02Compare upgrade vs. build
- 03Commit resources
- 04Watch wave performance
↻Feedback changes the situation — the next round starts from there.
Walk through one round
A simplified design example. Situations and numbers illustrate the mechanic, not exact rules from a reference game.
- T1
Turn 1 · The situation
With 300 gold, the player can upgrade an archer tower from level 2 to 3 (300, +80% damage), or build two level-1 towers at another junction (150 each).
- T2
Turn 2 · The player chooses
They upgrade, since the main road has the densest traffic.
- T3
Turn 3 · The feedback
The main road clears much faster, but the next side-lane wave meets almost no resistance.
- T4
Turn 4 · The next decision
With the next income they add two side towers and begin alternating upgrades and expansions.
How it plays
Towers upgrade in tiers with bigger gains and steeper prices; building new ones covers more ground. Build spots are often limited, so upgrading boosts efficiency per spot while building widens coverage. Per-tower damage stats, leak locations and open spots guide the decision.
What the player weighs
- Max one tower for a powerful effect, or spread risk across more towers.
- Upgrade early to clear faster, or claim key spots first.
02Start small
Scope is an editorial estimate for the minimum prototype, not the reference game or a production schedule.
03One mechanic, different implementations
Kingdom Rush
Build spots are fixed and limited, and towers branch into specializations at the top tier, so what goes in each spot and how far to upgrade matter.
Defense Grid: The Awakening
Towers upgrade several times for more damage and range, but placement also shapes the maze, so building new ones doubles as rerouting.
The difference worth noticing
With fixed spots, Kingdom Rush makes the choice purer; in Defense Grid, building also reshapes the route.
Case notes are Yoroll editorial summaries; rules may change between versions.
04What could you combine?
Let players borrow to upgrade early with interest accruing per wave, forcing them to judge whether the upgrade pays off the debt.
Prototype this combo in Yoroll→Follow the next idea
Keeping Turrets Supplied
A turret without ammo is a statue; the supply line is the defense's lifeline.
- Prototype complexity
- Who plays
- Solo decisions
- 01Build turrets
- 02Produce ammunition
- 03Lay supply lines
- 04Monitor stock and bottlenecks
Mazing the Enemy Path
Block paths into a maze; the longer enemies walk, the more damage they take.
- Prototype complexity
- Who plays
- Solo decisions
- 01Predict enemy pathing
- 02Place blocking structures
- 03Watch the path change
- 04Line the route with firepower
Supply-Driven Prices
Flood the market and prices fall; every sale moves the market.
- Prototype complexity
- Who plays
- Solo decisions
- 01Produce or stockpile
- 02Watch the price curve
- 03Sell at the right moment
- 04Your sale moves the price