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    <periodOfReport>2021-04-29</periodOfReport>

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    <issuer>
        <issuerCik>0001366246</issuerCik>
        <issuerName>GLU MOBILE INC</issuerName>
        <issuerTradingSymbol>GLUU</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001588852</rptOwnerCik>
            <rptOwnerName>Ball Eric R.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GLU MOBILE INC.</rptOwnerStreet1>
            <rptOwnerStreet2>875 HOWARD STREET, SUITE 100</rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94103</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
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    <footnotes>
        <footnote id="F1">On February 8, 2021, the Issuer entered into the Agreement and Plan of Merger (the &quot;Merger Agreement&quot;), with Electronic Arts Inc. (&quot;Electronic Arts&quot;), a Delaware corporation, and Giants Acquisition Sub, Inc., a Delaware corporation and wholly owned subsidiary of Electronic Arts, and the Issuer. Upon the closing (the &quot;Closing&quot;) of the transactions (the &quot;Merger&quot;) contemplated by the Merger Agreement on April 29, 2021, each share of the Issuer's common stock (a &quot;Share&quot;) was cancelled and converted into the right to receive an amount in cash, without interest, equal to $12.50 (the &quot;Per Share Merger Consideration&quot;).</footnote>
        <footnote id="F2">Each restricted stock unit (&quot;RSU&quot;) represents a contingent right to receive 1 Share upon settlement for no consideration.</footnote>
        <footnote id="F3">This award was fully vested and exercisable as of the Closing or was accelerated such that it was fully vested and exercisable in connection with the Merger.</footnote>
        <footnote id="F4">Upon the Closing, this award was cancelled and converted into the right to receive an amount in cash, without interest, equal to the product of the aggregate number of Shares subject to such RSU multiplied by the Per Share Merger Consideration.</footnote>
        <footnote id="F5">Upon the Closing, this award was cancelled and converted into the right to receive an amount in cash equal to the product of (x) the aggregate number of Shares subject to such option multiplied by (y) the excess of the Per Share Merger Consideration over the applicable per share exercise price of such option, without interest.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Eric Ball by Scott J. Leichtner, attorney-in-fact</signatureName>
        <signatureDate>2021-05-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
