A mod for Bloons TD 5 which is made by 5h3i1ah, adding many new maps into BTD5 as well as new custom towers and also some from David's XtraCards mod such as the Corsair Monkey.
Player88: "I found a cool BTD5 mod called Bloons TD 5 Expansion!"
Player441: "Interesting, I've heard of BTD4 Expansion and now we have a BTD5 Expansion?"
Player88: "You better check this awesome mod out sir!"
Player441: "Ok, hopefully it's something we'll try out!"