I put 4 stars because that is my rating for the base game. This is a set of extra cards, which increase variety but won’t change your opinion of the game.
Spy world is a slight variation on “Welcome To”. It plays very similarly as a flip and write with three decks where you pick a set of cards. The difference here is that you are building a secret lair and a master thief. After the flip and write portion ends, you have to use the master thief you built to go through the secret lair that another player built. It is fun enough, but we were constantly forgetting certain steps and, unsurprisingly, the lairs are going to be simple. Not sure how replayable the game is going to be.
This game is cute, fun, and quick. It's essentially truth or dare, but the consequence of not wanting to do the dare or tell the truth is that the hot potato might blow up on you, essentially. It's a great, speedy little game to play with friends. There are options to make your own prompts as well, and lots of chaos ensues.