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: Players must reach higher ranks (e.g., Level 24) to unlock powerful end-game upgrades. Tower Variety

: The game could run on aging school hardware, making it the ultimate "stealth" activity during computer lab sessions. 3. Psychological Appeal: Why BTD4? Unlike high-intensity shooters, BTD4 allowed for discreet gameplay btd4 unblocked

: Unlike many arcade games of the era, BTD4 allowed players to save their progress locally, encouraging long-term engagement over multiple sessions (or class periods). : Players must reach higher ranks (e