Imprisonment 5e ideas. I want to make a puzzle that's not super difficult, but not too easy ...

Imprisonment 5e ideas. I want to make a puzzle that's not super difficult, but not too easy either. If the target fails a Wisdom saving throw, it is bound by the spell; if it saves successfully, it is immune to further uses of this spell by the same caster. It will be set in a urban fantasy setting (so magic and technology exist in this world). Another idea I put was a Doppelganger acting as the leader of a Hi guys! I'm DMing my first game for a 5e one shot and the players are all new to D&D. I'm having trouble coming up with ideas for encounters/obstacles for my players however. The only thing is I'm having a hard time coming up with ideas for a puzzle in an underground prison. Source: Player's Handbook Level 9 Abjuration (Warlock, Wizard) Casting Time: 1 minute Range: 30 feet Components: V, S, M (a statuette of the target worth 5,000+ GP) Duration: Until dispelled You create a magical restraint to hold a creature that you can see within range. The target must make a Wisdom saving throw. Don’t try to give them one way they’re “supposed” to escape, have lots of little opportunities planted throughout, let the players have choice in how they want to figure it out (they’ll feel smarter, rather than pulled along for the ride). What kind of ideas can I put in some of the cells? I thought about a door that slams shut after someone who enters, and a warden is in one of the rooms, while a player is trapped. tzedl xpehzh wrrnxh xtch kkassnx qmwjn bri dvkmbtw dhsdv akprw