Sky Combat Guide
In-Flight Extractor (3000)
"Equips your plane with an extractor magnet which pulls coins toward your plane". It doesn't only magnet coins but powerups also.Additional Machine Gun (5000) and Rapid Fire Gun (5000)
You need to boost your damage to kill more enemy planes and get more moneyRegenerating Steel (15000)
Automatically replenishes health after over time if not taking fire. When wave increases, more difficulty, enemies and more coins also.Other upgrades and planes depends on your choice but this four upgrades are very important.
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