**(Brand-New Still In Original Case With Plastic-&-Security-Seal, Un-Opened).** **(Williamson), NBA2K21 For Xbox-One/Xbox-Series-X-Optimized. 4K-Ultra-HD/HDR. *Single-Player. **Multi-Player- (2-4). ***Online-Multi-Player- (2-10). ****Online-Co-Op- (2-10). **EVERYTHING-IS-GAME.**