You will receive an 'Alternative Sound' bonus for use in the game per the following title(s) you own.

・Contra Anniversary Collection
Link bonus:
Retro Mix (Contra, Super Contra)

・Castlevania Anniversary Collection
Link bonus:
Vania Mix (Castlevania, Dracula II: Simon's Quest, Castlevania III: Dracula's Curse)

・Arcade Classics Anniversary Collection
Link bonus:
Konamix (music from previous KONAMI titles)

Make sure to follow Contra: Operation Galuga for the latest news!
https://gtm.you1.cn/storesteam/app/2235020/Contra_Operation_Galuga/

Unleash hell against Red Falcon's forces right now with the Contra: Operation Galuga playable demo! Blast through a sampling of the game's jungle and waterfall areas solo or co-op to unlock bonuses in the full game when it launches on March 12!

Experience the explosive action through Contra: Operation Galuga's demo and unlock "300 Credits" and "Alternative Sound/WayForward Mix (Contra 4)" in the full game!

Make sure to follow the Steam Community page to keep up to date of all things Contra: Operation Galuga !

Make sure to follow the Steam Community page to keep up to date of all things Contra: Operation Galuga !
https://gtm.you1.cn/storesteam/app/2235020/Contra_Operation_Galuga/

Before the full mission begins, get a sample of what awaits in the Contra: Operation Galuga playable demo!
Complete the demo and unlock bonuses in the full game!

https://gtm.you1.cn/storesteam/app/2235020/Contra_Operation_Galuga/