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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-06-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001318482</issuerCik>
        <issuerName>SHOAL GAMES LTD.</issuerName>
        <issuerTradingSymbol>SGLDF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000923416</rptOwnerCik>
            <rptOwnerName>WILLIAMS GWYNN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>BALLACARRICK</rptOwnerStreet1>
            <rptOwnerStreet2>POOILVAAISH ROAD</rptOwnerStreet2>
            <rptOwnerCity>CASTLETOWN</rptOwnerCity>
            <rptOwnerState>Y8</rptOwnerState>
            <rptOwnerZipCode>IM9 4PJ</rptOwnerZipCode>
            <rptOwnerStateDescription>ISLE OF MAN</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2017-06-16</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2017-06-16</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>900000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.34</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>26987999</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>100% owned company</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Warrant</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.42</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2017-06-16</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2017-06-16</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>900000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.42</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2017-06-16</value>
            </exerciseDate>
            <expirationDate>
                <value>2018-06-15</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>900000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>900000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>100% owned company</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Pendinas Limited, which is 100% owned by Mr G. Williams, acquired 900,000 units of Shoal Games Ltd. for CAD$0.45(approximately US$0.34) per unit in a private placement on the 16th of June 2017. Each unit consists of 1 share and 1 warrant.</footnote>
        <footnote id="F2">Pendinas Limited, which is 100% owned by Mr. G. Williams, acquired 900,000 units of Shoal Games Ltd. in a private placement. Each unit consist of 1 share and 1 warrant. The exercise price of the warrants is CAD$0.55 (approximately US$0.42) per share for the first six months following closing and $0.65 (approximately US$0.49) per share for the period which is 7-12 months following closing.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ G. Williams</signatureName>
        <signatureDate>2017-06-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
