Sure, I'd be happy to help you with that. Here's a step-by-step guide on how to play Spotify playlists offline:

1. First, make sure you have a Spotify Premium subscription. Offline listening is a feature that's only available to Premium users.

2. Open the Spotify app on your device.

3. Go to the playlist that you want to download for offline listening.

4. Toggle the "Download" switch to ON. The switch will turn green, and Spotify will begin downloading the songs in the playlist to your device.

5. Once the songs are downloaded, a green arrow will appear next to each song. This indicates that the song is available for offline listening.

6. To listen to your playlist offline, go to "Your Library" in the Spotify app.

7. In the settings, toggle the "Offline" switch to ON. This will put Spotify in Offline Mode, and you'll only be able to play songs that you've downloaded.

Remember, while in Offline Mode, you can't stream songs, so make sure to download any playlists or albums you want to listen to before going offline. Also, Spotify requires you to go online at least once every 30 days to keep your offline music.

I hope this helps! Let me know if you have any other questions.