Indeed, you can play via the Keychain app.
https://miningwar.slothbuzz.com

This round ends in the next 24 hours; it's probably better to wait for the new one to start for the best chance to earn a little something. Although it's always worth having a look now to read up on some of the mechanics and decide on a strategy ;)

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Testing the new 'Engage' features on Slothbuzz.com !SLOTH