Xcom Enemy Within Upd [best] -

The expansion introduces several game-changing systems that force players to rethink their tactical approaches:

(and much longer if you're a perfectionist), it offers incredible value. If the base game feels too easy, there is always the Long War mod xcom enemy within upd

While there have been no major official content updates since its mobile and console ports, the game remains highly relevant through platform-specific compatibility and community projects: Steam Deck & Modern OS Compatibility : The game is verified as Playable on Steam Deck xcom enemy within upd