This is one of the most useful RPG supplements I have purchased in a long time. It is hard to come up with interesting traps. These decks have excellent traps that are, most of all, very usable in games. They also provide interesting clues for players to be able to detect that a trap is in place, which makes the player experience more interesting. The players have an opportunity to figure out that something is wrong. The cards are brief but contain all the relevant information like the trigger, the effect, etc. That provides the DM the information to give meaningful information to the players as they interact with the environment. I will be using these alot!