myKonami Slots is part of the myVEGAS family. In addition to all of the usual myVEGAS Rewards, they have their own special myKonami Freeplay Reward. It is a $25 Freeplay Reward that can be used exclusively on a bank of Konami slot machines near the Mlife desk of the MGM Resort the reward is for.
The Rewards are specific to each particular hotel and can be found in the Rewards list for each hotel. To use it at Aria, you need to get the Reward displayed in the Aria list. To use it at Luxor, you need to get the one displayed in the Luxor rewards list.
You do not have to be staying at the particular resort in order to use the Freeplay. Otherwise, the typical restrictions apply (3 in 30, 1 per player, etc)