Help rescue endangered butterflies! Construction projects in your city are disrupting the butterfly's natural habitat. Capture butterflies and deliver them to protected butterfly gardens in botanical gardens, local zoos and museums.

The game is played over a series of rounds. Players begin each round by playing a card from their hands to determine the round's turn order. Cards are numbered from 0 to 59, and lower numbered cards starts. On a turn, the player captures butterflies from the field and adds them to the jar. When possible, players "deliver butterflies" from their jars to the different butterfly gardens to obtain victory points (VPs). Which butterflies can be delivered is indicated on the face-up "delivery cards" and players are often in a competition to deliver butterflies to take the cards and score points. The player with the most VPs when the game ends wins.

During the game, players must carefully choose which butterfly cards to play. By playing lowered numbered cards, players will not only get a better pick of butterflies in the field, but they also get first chance at delivering butterflies. However, lower numbered butterfly cards will usually have fewer butterflies on them, so players cannot add as many to their jars. Also, butterfly cards with special powers usually have high numbers, so you often have to sacrifice turn order in order to use one of these special powers.

In this second edition, both the artwork and components have been upgraded. A major rule change is an all new set-collection aspect of the delivery cards. There are now 4 types of delivery cards and players will score a bonus for having a variety. Also, there are some minor rule changes with scoring butterflies in one's hand and the jar at game end. Another small alteration is in the special powers on some of the cards.

The maximum number of players in the second edition was reduced to 5 from 6.