Question about Swagbucks Mobile apps offers.

First Id like to say that english is not my first so please bear with me.

I am currently on the process of playing a casino game and was wondering if I can use 2 devices to play the game. I have an extra phone with me and Id like to be able to play on both devices (not simultaneously, just use it as an extra when my other phone is unavailable). Will it still work? Or am I only allowed to download the game on a single device? Thanks.