It features original FM-synth music (Yamaha YM2151 sound chip), pixel art (PC-98) backgrounds, and yes, oppai!
Price comparison
GAMIVO Oppaidius Summer Trouble! EN/IT/JA Global
€1,13
Difmark Oppaidius Summer Trouble PC Global -10%: gamekeycompare
€2,26 €2,03
G2A Oppaidius Summer Trouble! Steam Key GLOBAL
€3,23
Kinguin Oppaidius Summer Trouble! Steam CD Key -5%: GKC5
€17,06 €16,21
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Oppaidius Summer Trouble! is available from 1.13 to 16.21 from 4 shops.