Coin Stacker: Merge

Core Game Rules
1. Coin Denomination Types
- 1 Coin: Low-value basic token, massive spawn volume, small single score gain
- 10 Coin: Standard medium-value coin, the only token players can manually launch
- 50 Coin: Rare mid-high value token, spawns randomly in central grid area
- 100 Coin: Top-tier high-score coin, grants massive score when pushed off the platform
- Bill Token: Special currency token, tallied in top-left "bills" counter, used for permanent Assist skill upgrades
2. Drop Limit Mechanic
The "To add" counter limits how many coins you can launch per turn; each tap of the launch button consumes 1 count. The counter refills automatically after clearing batches of coins off the grid.
3. Physics Collision Logic
All coins follow real physical gravity and collision rules. Falling coins generate forward thrust on stacked piles, creating domino-style chain pushes. Coins blocked by the two large fox guardian statues require repeated coin impacts to shift free.
4. Assist Boost System
The bottom-right Assist gauge fills percentage-wise with every coin pushed off the platform. Once fully charged, the Assist skill activates automatically, spawning dozens of bonus coins to clear dense stacked piles and boost score rapidly.
5. Bill Currency Function
Collected bills are stored in the top-left counter, exchangeable in the in-game shop for permanent buffs: extra drop coins per round, faster Assist gauge charging, higher coin score multipliers.