If you're looking for a gaming phone that is cheap and has features that define a gaming phone, then you'll have to increase your budget by a bit. We are talking about video games such as Genshin Impact, Pokémon GO, Battlegrounds Mobile India (BGMI) and the likes. Most phones in this segment tend to feature low-end SoCs which give moderate stability in gaming with average frame rates that are barely hitting 30. In key moments, these phones will experience significant FPS drops and stuttering which leads to a sub-par gaming experience. Charging these phones while gaming will give you a little better performance but gaming and charging at the same time is never advised and will lead to higher heat generation. If you're into casual gaming, then any phone under 10,000 should make the cut. You can check out the best phones under 10000 for casual gaming.
The Xiaomi Mi A2 is another good phone to play games on thanks to the Snapdragon 660 under the hood.