How to Get the Undertale Background on Steam
Easiest way: buy, trade, or craft Undertale trading cards on Steam. You'll get a background when you complete a set.
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Just completed my Undertale badge the other day and got a cool background! Just trade some cards or buy them on the Steam Marketplace.
Forget all that fancy talk, just buy the trading cards directly on the Steam Marketplace. Easy peasy!
You can also check the Steam Community Market for Undertale-specific backgrounds and purchase them directly if you have the funds!
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