Coin Slide: Stack Win

Merge banknotes of the same denomination by stacking them to upgrade into higher-value cash. Performing any currency fusion won’t consume your move count at all. Construct a closed loop made of thousand-unit banknotes surrounding a pile of cash stacks, and all nearby banknotes will get cleared away completely.

Game features:
- Same-value banknote stacking and fusion as the core puzzle mechanism
- Unique move-saving rule: all currency merges cost zero operation turns
- Surround clear skill: enclose cash piles with thousand-denomination bills to wipe surrounding cash
- Multi-tier currency iteration design for continuous value upgrading
- Strategic layout planning to create large-area clearing combos