Upgrade Sub
Upgrade Sub is an exciting Action Game and published on Jan 6th, 2012 and has been played 421 times and has a rating of 63% after 8 votes.
Turn your weak red sub into an unstoppable Juggernaut. This game takes patience, but stick with it. You start off incredibly weak and will die right away, but thanks to a generous flow of currency, you will quickly be able to upgrade your sub.
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