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Document and Entity Information
 12 Months Ended
Dec. 31, 2025
shares
Document and Entity Information  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2025
Document Fiscal Year Focus 2025
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-34238
Entity Registrant Name The9 LTD
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 17 Floor, No. 130 Wu Song Road
Entity Address, Address Line Two Hong Kou District
Entity Address, City or Town Shanghai
Entity Address, Postal Zip Code 200080
Entity Address, Country CN
Entity Common Stock, Shares Outstanding 4,567,660,012
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction false
Document Accounting Standard U.S. GAAP
Entity Shell Company false
Auditor Firm ID 587
Auditor Name RBSM LLP
Auditor Location New York, New York
Entity Central Index Key 0001296774
Document Fiscal Period Focus FY
Amendment Flag false
Business Contact  
Document and Entity Information  
Contact Personnel Name George Lai
Country Region 86
City Area Code 21
Local Phone Number 6108-6080
Contact Personnel Email Address georgelai@corp.the9.com
Entity Address, Address Line One 17 Floor, No. 130 Wu Song Road
Entity Address, Address Line Two Hong Kou District
Entity Address, City or Town Shanghai
Entity Address, Postal Zip Code 200080
Entity Address, Country CN
American Depositary Shares  
Document and Entity Information  
Title of 12(b) Security American Depositary Shares
Trading Symbol NCTY
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 412,731,807
Class A ordinary shares  
Document and Entity Information  
Title of 12(b) Security Class A ordinary shares, par value US$0.01 per share
No Trading Symbol Flag true
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 4,504,052,678
Class B ordinary shares  
Document and Entity Information  
Entity Common Stock, Shares Outstanding 63,607,334