gridlock

tune: level up every 3 lines (was 10) — materials evolve within first dozen clears

feat: wild zones (non-blocking rainbow cross that completes lines, consumed on clear); level system with evolving block materials replaces fruit sprites

feat: specials prefer never-built-on cells (3x weight); native shell follows system color scheme

feat: Rush time targets — marked blocks bank 2-5 bonus seconds when their line clears

feat: fruit sprites that evolve with line clears (Noto Emoji, Apache 2.0); auto dark/light theme from system; closable menu mid-game