I have held off on this review for a while to eliminate "luck" from the equation. Yes this game has ads both for its own products and other games, it's free, that's how they make money. But despite their claims in other review replies you DO have to pay to get past a point. The simple fact is you become too weak to progress without upgrading and the items needed to do so are not available as in game rewards. Pay to play, no. Pay to progress, absolutely. Sad because its a fun game for level 1.