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Sure! Much of the Splinterlands economy is defi-like, not gaming. So yes, you can stake your SPS without playing (just like you can hold cards without playing), but you have to do it from the game. To join the game you simply go to Splinterlands homepage and choose log in and use your Hive username. Then, from the SPS management page you can transfer SPS from Hive-Engine in-game and stake it. You can, alternatively, use one of the pools for a higher APR.