Mystery of Time and Space is one of the best online games ever and a real workout for your brain.
You wake up in a locked room. You don’t know how you got there, you don’t why you’re there, you do want to get out. Every time you get out of a room, there’s another one waiting for you. Frustrating but fascinating.
The gameplay is very simple: click on things in the room. Some you can use, others will give you a comment: “It’s a chair!” Objects can be collected but are usually used within the same room.
Best of all, your computer will usually remember where you were last, so you can continue from where you left – assuming you don’t want to go back to the start.