Phantom Echo

One of the few games I can always go back to. No potential grind, but a lot of fun to test my mind on in terms of getting survivors and a crystal out to safety - be it a perfect run, a squad of four powerful heroes, or even with limitations (one-man run, starting with only a few modules in the beginning, or even not being able to deactivate powered rooms). I can definitely attest to this being a fun game to be had either in single-player or up to four players!