There are several budget gaming phones under 12k that you can consider:
1. Realme Narzo 10A - This phone features a MediaTek Helio G70 processor, a 6.5-inch HD+ display, and a 5000mAh battery. It is priced at around 8,999 INR.
2. Redmi 9 Prime - This phone is equipped with a MediaTek Helio G80 processor, a 6.53-inch Full HD+ display, and a 5020mAh battery. It is priced at around 9,499 INR.
3. Realme C15 Qualcomm Edition - This phone features a Snapdragon 460 processor, a 6.5-inch HD+ display, and a massive 6000mAh battery. It is priced at around 9,999 INR.
4. POCO M2 - This phone is equipped with a MediaTek Helio G80 processor, a 6.53-inch Full HD+ display, and a 5000mAh battery. It is priced at around 10,499 INR.
5. Infinix Hot 10 - This phone features a MediaTek Helio G70 processor, a 6.78-inch HD+ display, and a 5200mAh battery. It is priced at around 9,999 INR.
All of these phones offer good gaming performance and are great value for money.