Brainstormed design for a lightweight booster economy (hammer/shuffle/
line-bomb) earned via a 7-day login calendar and rewarded ads, used in
a stage via a booster bar. Boosters mutate the grid only — no move cost,
no score/combo, no objective credit — so stage balance is preserved
while they can rescue a dead board. Approved by owner; next: impl plan.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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