So I was wondering if someone is playing a game on the TV can I play on a different device at the same time
Not using the same account.
If you have 2 separate accounts, you certainly can and if you want to play different games but don't want to pay twice, if you're in the same family, you can set up Family Sharing through Google Family.
Not using the same account.
If you have 2 separate accounts, you certainly can and if you want to play different games but don't want to pay twice, if you're in the same family, you can set up Family Sharing through Google Family.