Amplitude Studios’ Endless universe has been built up quite extensively over the years. Whether it’s the 4X machinations of Endless Space or the rogue-lite quirks of Dungeon of the Endless, there’s quite a lot to go through. The entire franchise is on sale this weekend, but you can also try any of the games for free until January 28th, 7 AM PT.

The games in question include Endless Legend, a 4X title with stunning art-work and compelling factions. Then there’s Endless Space 2, a 4X space expansion title that builds significantly on the first game. Finally, we have Dungeon of the Endless, which mixes way too many genres to count (more about that here).

If any of these titles catch your fancy, then you can pick them up for pretty deep discounts on Steam (and even snag the Endless Space Collection for cheap). Amplitude continues to release new expansions for Endless Space 2 and Endless Legend. The former has received Penumbra, which brings the hack-tastic Umbral Choir to the universe, while the latter receives Symbiosis with its assimilating Mykara.

Amplitude Studios continues to release expansions for Endless Legend, its 4X turn-based strategy game featuring a myriad of fantastical factions. The latest is Symbiosis, out on January 24th for $12.99 on Steam. Pick it up before February 4th to avail of a 10 percent discount, or check out the trailer for Symbiosis below.

The expansion introduces a brand new faction called the Mykara. As a civilization that started as unicellular organisms before evolving into warriors, the Mykara seek balance for the planet. Their key traits include overgrowing different points of interest and converting conquered cities for additional resources. When enough turns pass, they gain bonus traits from the conquered cities.

Along with a new faction are the new Gigantic units, the Urkans. They’ll roam the neutral zones on the map randomly and must either be defeated in battle or bribed to use them. Achieve that and you’ll unlock some new abilities to further augment your fighting capabilities.