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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 20-F/A

(Amendment No. 1)

(Mark One)

OR

For the fiscal year ended December 31, 2013

OR

For the transition period from                      to                     

OR

Date of event requiring this shell company report                     

Commission file number: 001-35645

China Mobile Games and Entertainment

Group Limited

(Exact Name of Registrant as Specified in Its Charter)

N/A

(Translation of Registrant’s Name Into English)

Cayman Islands

(Jurisdiction of Incorporation or Organization)

Block A, 15/F Huajian Building

233 Tianfu Road, Tianhe District,

Guangzhou, PRC

(Address of Principal Executive Offices)

Ken Fei Fu Chang, Chief Financial Officer

13^th Floor, Asia Pacific Centre

No. 8 Wyndham Street, Central, Hong Kong

Tel: (852) 2700-6168

Email: ir@cmge.com

(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to Section 12(b) of the Act:

Securities registered or to be registered pursuant to Section 12(g) of the Act:

None

(Title of Class)

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:

None

(Title of Class)

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report.

211,433,087 Class A ordinary shares and 180,821,228 Class B ordinary shares, par value $0.001 per share, as of December 31, 2013.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act    Yes  ¨    No  x

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934    Yes  ¨    No  x

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files)    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  ¨                 Accelerated filer  x                 Non-accelerated filer  ¨

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.    Item 17  ¨    Item 18  ¨

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

(APPLICABLE ONLY TO ISSUERS INVOLVED IN BANKRUPTCY PROCEEDINGS DURING THE PAST FIVE YEARS)

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Sections 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.    Yes  ¨    No  ¨

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Explanatory Note

This Amendment No. 1 on Form 20-F/A (this “Amendment No. 1”) to our annual report on Form 20-F for the year ended December 31, 2013, filed with the Securities and Exchange Commission on March 7, 2014 (the “2013 Form 20-F”), is filed to disclose our management’s annual report on internal control over financial reporting in Item 15. This Amendment No. 1 also includes new language in “Item 3. Key Information—D. Risk Factors” detailing the potential consequences of failing to disclose management’s annual report on internal control over financial reporting in the 2013 Form 20-F. As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by our chief executive officer and chief financial officer are being filed as exhibits to this Amendment No. 1. The amended portion of Item 19 Exhibits is repeated in this Amendment No. 1.

This Amendment No. 1 speaks as of the filing date of the 2013 Form 20-F on March 7, 2014. Other than as set forth above, this Amendment No. 1 does not, and does not purport to, amend, update or restate any other information or disclosure included in the 2013 Form 20-F or reflect any events that have occurred since March 7, 2014.

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Part I

Item 3. KEY INFORMATION

Our current ineligibility to use a Registration Statement on Form F-3 may affect our ability to access the public markets quickly to raise debt or equity capital.

As a result of the fact that we are amending our Form 20-F to correct an Item 15 disclosure deficiency, we are ineligible to register sales of our securities on the SEC’s short-form registration statement, Form F-3. We will not be eligible to use Form F-3 to conduct registered public offerings until our filings with the SEC have been timely made for 12 full months, assuming the other eligibility criteria are satisfied at that time. While we are ineligible to use Form F-3, which is faster and less costly to prepare, we will be required to file a long-form registration statement in order to effect a registered public offering. This will negatively affect our ability to access the public capital markets quickly and flexibly until we are once again eligible to use Form F-3. Furthermore, certain investors, for whom the ability to resell their shares relatively soon after they acquire them is important, may only be willing to participate in private financings by us if we can register their shares using a Form F-3. Therefore, our ineligibility to use Form F-3 may limit our ability to raise additional capital from such investors.

Part II

Item 15. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our chief executive officer and our chief financial officer, we carried out an evaluation of the effectiveness of our disclosure controls and procedures, which is defined in Rules 13a-15(e) of the Exchange Act, as of December 31, 2013. Based on that evaluation, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures as of December 31, 2013 were not effective solely as a result of the material weaknesses in internal control over financial reporting as described below and in “Item 3. Key Information. D—Risk Factors— If we fail to maintain an effective system of internal control over financial reporting, we may lose investor confidence in the reliability of our financial statements.”

Management’s Annual Report on Internal Control over Financial Reporting

Our management, including our chief executive officer and chief financial officer, is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. GAAP. Our internal control over financial reporting includes those policies and procedures that:

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

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As required by Section 404 of the Sarbanes-Oxley Act and related rules as promulgated by the SEC, our management, including our chief executive officer and chief financial officer, assessed the effectiveness of our internal control over financial reporting as of December 31, 2013 using criteria established in “Internal Control—Integrated Framework (1992)” issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on its assessment, our management concluded that, as of December 31, 2013, our internal control over financial reporting was not effective based on the above criteria as a result of a material weakness in internal control over financial reporting. The material weakness relates to insufficient personnel with U.S. GAAP expertise in the preparation and review of the financial statements and related disclosures in accordance with U.S. GAAP and the SEC reporting requirements. We have taken initiatives to improve and will continue to strengthen our internal control over financial reporting and disclosure controls. For details on these initiatives, please see “Item 5. Operating and Financial Review and Prospects—Internal Control Over Financial Reporting.”

Attestation Report of the Registered Public Accounting Firm

This annual report does not include a report of an attestation report of the company’s registered public accounting firm due to a transition period established by rules of the SEC for emerging growth companies.

Changes in Internal Controls Over Financial Reporting

As described above and in “Item 3: Key Information—D. Risk Factors,” there was one material weakness identified in our internal control over financial reporting, which related to insufficient personnel with U.S. GAAP expertise in the preparation and review of the financial statements and related disclosures in accordance with U.S. GAAP and SEC reporting requirements. In connection with the audit of our consolidated financial statements for the year ended December 31, 2013, we and our independent registered public accounting firm determined that the above-mentioned material weaknesses in our internal control over financial reporting continue to exist.

We have undertaken certain remedial steps to address the material weakness. For example, we have (i) provided and continue to provide additional training for our new and existing personnel by expanding the training program on U.S. GAAP financial statement preparation and financial reporting and (ii) hired additional staff with financial reporting experience. In particular, since the beginning of 2013 we have hired one finance manager, two assistant finance managers and one internal audit manager.

Part III

Item 19. EXHIBITS

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SIGNATURES

China Mobile Games and Entertainment Group Limited hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this Amendment No. 1 on Form 20-F/A on its behalf.

Date: March 20, 2015