There are more than half a dozen add-ons to choose from right now, so you can always mix things up if the base game loses its shine. Naturally, you can add to that chaos with many, many expansions packs. It's energizing in a way few classic board games are. Each match is very unpredictable as a result, and you're always given wild new strategies to overcome. Gameplay: Because there are 51 alien species on offer (all with their own unique power), it's rare for two games to play out the same way. Most break established rules in some way, whether it's winning by losing or reversing attack card numbers so weaker ones overpower your opponents. However, things screech into the left-field thanks to the species you'll be using. playing a larger number from the cards in your hand) or through diplomacy. How it works: On paper, Cosmic Encounter is straightforward - you have to establish colonies on planets owned by your rivals.