<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>0014 - Disclosure - 8. The Big Easy Gaming Vessel</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>From2011-07-01to2012-06-30</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001020477</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2011-07-01T00:00:00</PeriodStartDate><PeriodEndDate>2012-06-30T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="12 Months Ended" /><Label Key="Calendar" Id="1" Label="Jun. 30, 2012" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>1</Level><ElementName>ROBK_NotesToFinancialStatementsAbstract</ElementName><ElementPrefix>ROBK_</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Notes to Financial Statements</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>ROBK_BigEasyGamingVesselTextBlock</ElementName><ElementPrefix>ROBK_</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="From2011-07-01to2012-06-30" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0"&gt;On June 10, 2010, the Company purchased The Big Easy, a gaming
vessel for the Gulfport Project, for an aggregate purchase price of $4,264,500, payable: (a) by issuance of a secured note payable
to the seller of $2,975,000 (the Secured Note), (b) issuance of an unsecured note payable to the seller of $600,000 (Unsecured
Note), fees of $414,500 and cash of $275,000. The Secured Note is collateralized by the gaming vessel and both notes are guaranteed
by an officer of the Company. The Secured Note was payable on June 11, 2011 and bears interest at 14.5%, per annum, payable $35,000,
per month, commencing June 11, 2010. The Unsecured Note&lt;/p&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0"&gt;bears interest at 14.5%, per annum, and is payable monthly,
in an amount equal to 2% of the monthly gross gaming revenue generated from operations, as defined, until June 2012 when all principal
and interest are due. Since September 17, 2010, both notes have been in default and the interest rate was increased to 20%, per
annum.&lt;/p&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0"&gt;As of June 30, 2011, the due dates of both notes were extended
in support of the Company&amp;#146;s current project in Gulfport, MS and the Trustee of the Cruise Holdings bankruptcy estate, holding
the mortgage and promissory note payable has consented;&amp;#160;&amp;#160;(1) to require no payments through June 30, 2012; (2) that the
collection fees and accrued interest be paid on or before October 1, 2012; (3) extend the due date of the balance of the obligation
for the principal and accrued interest to July 1, 2013.&amp;#160;&amp;#160;As of August 16, 2013, the Company has not repaid the principal
and accrued interest by the dates stipulated in the extension and, therefore, is currently in default.&amp;#160;&amp;#160;As a result,
the balances as of the mortgage payable, note payable and accrued interest have been reflected as current liabilities in the Company&amp;#146;s
balance sheet as of June 30, 2012.&lt;/p&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0"&gt;In May 2011, the equity investor informed RBMS it would not
move forward with the financing of the Gulfport Project unless the casino was land based.&amp;#160;&amp;#160;As a result, it was decided
the vessel be sold at a public auction, however, the public sale did not yield sufficient funds to eliminate the fees and mortgage
debt.&amp;#160;&amp;#160;The Company received $459,746 in the reduction of accounts payable from the public sale which was paid directly
to vendors of the Company. June 30, 2011, the Company recorded a loss of $4,191,891 on the sale of the gaming vessel.&amp;#160;&amp;#160;The
Company is currently in discussions with the mortgage holder and the trustee to reach an agreement to extinguish the mortgage of
$2,975,000 and note payable of $600,000 through the issuance of equity.&lt;/p&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0"&gt;&amp;#160;&lt;/p&gt;

&lt;p style="font: 8pt/normal Times New Roman, Times, Serif; margin: 0"&gt;On December 20, 2012 the Company, an officer of the Company
as Guarantor entered into a Settlement Agreement (Agreement) with the Trustee for the estate of the gaming vessel which set forth
terms related to the consideration to be paid by the Company to the Trustee in exchange for the release of all claims against the
Company and the Guarantor, including all promissory notes, penalties, fees and interest. The Agreement is subject to the order
of approval by the US Bankruptcy Court, Southern District of Florida, West Palm Division and will become effective upon the first
business day of RBMS&amp;#146;s closing on primary equity and debt financing for not less than $100,000,000 for the design, construction
and opening of a casino resort in Gulfport, MS. Pursuant to the terms of the Agreement, upon closing, the Company shall deliver
to the Trustee 250,000 shares of Series B Subordinated Participating Preferred Stock in Rotate Black, to be designated&amp;#160;&amp;#160;These
Series B Preferred shares will be fully redeemed through payments to the Trustee totaling $5,000,000 and will be determined as
a percentage of the Company&amp;#146;s gross cash receipts each year, as defined. The payments will be due on a monthly basis.&amp;#160;&amp;#160;The
Series B shares will be subordinated to a maximum of $2,500,000 of Series A Preferred shares.&amp;#160;&amp;#160;The Series B are fully
redeemable by the Company in part or in full based upon a schedule whereby the balance will be adjusted; (1) within the first three
months of the closing to $2,000,000; (2) within the first 15 months of closing to $2,500,000; (3) within the first 27 months of
closing to $3,000,000; (4) within the first 39 months of closing to $3,500,000; (5) within the first 51 months of closing to $4,000,000;
and (5) after 51 but before 59 months of closing the Company is obligated to pay $5,000,000.&amp;#160;&amp;#160;If the Series B Preferred
is not redeemed on an accelerated basis or in accordance with the terms of the Agreement, the Company shall pay the Trustee the
sum of $5,000,000, plus 12% interest, per annum, over the five years, with default provisions as defined.&lt;/p&gt;

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