<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-01-03</periodOfReport>

    <issuer>
        <issuerCik>0001162556</issuerCik>
        <issuerName>DOVER DOWNS GAMING &amp; ENTERTAINMENT INC</issuerName>
        <issuerTradingSymbol>DDE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001205788</rptOwnerCik>
            <rptOwnerName>BAGLEY PATRICK J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1131 N. DUPONT HIGHWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DOVER</rptOwnerCity>
            <rptOwnerState>DE</rptOwnerState>
            <rptOwnerZipCode>19901</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, $.10 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2011-01-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1319</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.46</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>28620</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Includes 17,570 shares of restricted stock granted under the Company's Incentive Stock Plan in transactions exempt under Rule 16b-3 (full amount of original grant, whether or not vested, less shares disposed of, if any).  Shares vest one fifth per year beginning on the second anniversary of the grant date (beneficial ownership in unvested shares is disclaimed for Section 16 purposes).  Grant dates and number of shares granted were:  January 3, 2007:  5,000 shares; January 3, 2006:  7,500 shares; January 3, 2005:  6,000 shares; and April 28, 2004:  6,000 shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Elia D. Trowbridge Via Power of Attorney Filed With the Securities &amp; Exchange Commission</signatureName>
        <signatureDate>2011-01-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
