Journey to Tír na nÓg

From BoardGameGeek:

Your backpacking trip through the lush greenery of the Irish countryside is interrupted by a strange visitor. This giant man, calling himself The Dagda, presents you with a series of challenges to overcome. Only the clever and pure of heart will solve them all and gain entry to Tír na nÓg! Journey to Tír na nÓg is a game in the 18Escape series of cooperative puzzle games from Grand Gamers Guild. In each game, you solve a full-length, escape-room-style mystery using just 18 playing cards! Puzzles may test your perception, wordplay, and lateral thinking. English language fluency is required. This game uses a website to check your answers and provide hints and information. When you have solved a puzzle on the cards, you will enter the answer into the website (compatible with all smart phones and computers) and you will be instructed on what to do next. The website also contains a graduated hint system, so if you get stuck you can get just a small hint about the current puzzle to get moving again without giving too much away. This system is non-destructible: some groups may choose to write on cards, but this is not required. A group cannot re-play the game, but can pass it on to another group for their use. -description from the publisher