The game in 24 episodes - playable in one piece or over 24 days. Professor Charlie has found a strange document in his letterbox. The mission in it concerns Charlie's latest invention: his time machine. Can you help Charlie on his journey through time and uncover the fabulous secret of the 24 Guardians? The puzzle game in 24 episodes can be played in one go or on 24 days, i.e. also as an advent calendar. If you solve a puzzle every day, you will need between 5 and 15 minutes. If you play the game in one piece, you should plan around 3-4 hours.