Rise of Immortals players using the Steam version will want to check in this weekend to earn a series of Halloween achievements and holiday-themed skins.

The team is also handing out a nice treat to players who refer a friend. A special link has been provided. New players taking advantage of the referral and reaching level 5 will score Petroglyph coins for their friend.

Lastly, four Immortals can still be played for free for a limited amount of time before heading into the premium store.

Grab all the details on the Rise of Immortals page.