Filed by Pinnacle Entertainment, Inc.
                       Pursuant to Rule 425 under the Securities Act of 1933 and
     deemed filed pursuant to Rule 14a-12 of the Securities Exchange Act of 1934

                                              Subject Company: Aztar Corporation
                                                     Commission File No. 1-12092

On April 28, 2006, Pinnacle Entertainment, Inc. published the following press
release:

UPDATING AND REPLACING


[PINNACLE ENTERTAINMENT LOGO]                 PINNACLE ENTERTAINMENT, INC.
                                              3800 Howard Hughes Parkway
                                              Las Vegas, Nevada 89109
                                              NYSE: PNK
===============================================================================

FOR FURTHER INFORMATION:

PINNACLE ENTERTAINMENT:                  JOELE FRANK, WILKINSON BRIMMER KATCHER:
-----------------------                  ---------------------------------------
Lewis Fanger (Investors)-(702)784-7777   Matthew Sherman (Media)-(212)355-4449
Pauline Yoshihashi (Media)-(702)784-7777

      PINNACLE ENTERTAINMENT AMENDS PROPOSAL TO ACQUIRE AZTAR CORPORATION
      TO $48.00 PER COMMON SHARE IN CASH AND STOCK, SUBJECT TO ADJUSTMENT

LAS VEGAS,  APRIL 28,  2006 - Pinnacle  Entertainment,  Inc.  (NYSE:  PNK) today
announced  that its Board of Directors has  unanimously  approved an increase in
the  per-share  price  under  the  Company's  proposal  to  acquire  all  of the
outstanding  common shares of Aztar Corporation (NYSE: AZR) to $48.00 per share,
subject to adjustment.  The  consideration  consists of $45.00 per share in cash
and $3.00 per share of Pinnacle common stock, subject to a collar provision. The
purchase  price  for each  share of Aztar  Series  B  preferred  stock  has been
increased to $475.94 in cash, plus $31.73 in Pinnacle  common stock,  subject to
the collar provision. The fully financed transaction is valued at $2.46 billion,
including  approximately  $1.85  billion in equity on a fully  diluted basis and
approximately $677 million of indebtedness.

Each share of Aztar common stock would receive a fraction of a share of Pinnacle
common stock equal to $3.00 divided by the trading price of a share of Pinnacle
common stock over a specified  trading  period,  but no more than 0.12976 shares
and no fewer than 0.08651 shares.

As announced on April 24, 2006, Pinnacle and Aztar had previously amended their
definitive merger agreement, under which Pinnacle would acquire all of the
outstanding common shares of Aztar for $45.00 per share in cash. In raising the
proposed merger price to $48.00 per share, Pinnacle exercised its right under
the merger agreement to respond to a third-party proposal. Pinnacle's offer
remains open until 5 p.m. (New York City time) on Friday, April 28, 2006.

ABOUT PINNACLE ENTERTAINMENT
Pinnacle Entertainment owns and operates casinos in Nevada, Louisiana, Indiana
and Argentina, owns a hotel in Missouri, receives lease income from a card club
casino in the Los Angeles metropolitan area, has been licensed to operate a
small casino in the Bahamas, and owns a casino site and has significant
insurance claims related to a hurricane-damaged casino previously operated in
Biloxi, Mississippi. Pinnacle opened a major casino resort in Lake Charles,
Louisiana in May 2005 and a new replacement casino in Neuquen, Argentina in July
2005. Pinnacle also has two casino development projects in the St. Louis,
Missouri area. The development projects are dependent upon final approval by the
Missouri Gaming Commission.

FORWARD-LOOKING  STATEMENT
All statements included in this press release, other than historical information
or statements of historical fact, are  "forward-looking  statements"  within the
meaning  of  the  Private  Securities  Litigation  Reform  Act  of  1995.  These
forward-looking  statements,  including  statements regarding Pinnacle's pending
acquisition of Aztar,  the growth  opportunities  and synergies for the combined
company, current and potential future development  opportunities and anticipated
opening dates, are based on Pinnacle  management's  current expectations and are
subject  to  risks,  uncertainties  and  changes  in  circumstances  that  could
significantly  affect future results.  Accordingly,  Pinnacle  cautions that the
forward-looking  statements  contained herein are qualified by important factors
that could cause actual  results to differ  materially  from those  reflected by
such statements. Such factors include, but are not limited to: (a) the risk that
the  acquisition  does not close;  (b) the  substantial  increase in  Pinnacle's
indebtedness  if the acquisition  closes;  (c) Pinnacle's  redevelopment  of the
Tropicana  Las Vegas site would be a project of a larger scale than any Pinnacle
has undertaken, and is subject to significant risks and contingencies, including
the





availability  and cost of financing  and  construction  risks;  (d) the combined
company's  post-acquisition  results of  operations  may not meet  expectations,
which may make it  difficult  for  Pinnacle to service the debt  Pinnacle  would
incur in the  transaction;  (e) the risk that new projects and expansions  could
strain  Pinnacle's  financial  resources  and might not provide for a sufficient
return,  if any;  (f)  significant  competition  facing  Pinnacle  in all of its
markets;  (g) many  construction-related  factors  could  prevent  Pinnacle from
completing its construction and development  projects within budget and on time;
and (h) other  risks,  including  those as may be detailed  from time to time in
Pinnacle's filings with the Securities and Exchange Commission ("SEC"). For more
information  on the  potential  factors that could affect  Pinnacle's  financial
results and  business,  review  Pinnacle's  filings with the SEC,  including its
Annual Report on Form 10-K,  its Quarterly  Reports on Form 10-Q and its Current
Reports on Form 8-K.

NOTE: In connection with the proposed transaction, Pinnacle
Entertainment,  Inc. intends to file a registration statement, including a proxy
statement of Aztar  Corporation,  and other  materials  with the  Securities and
Exchange  Commission (the "SEC").  Investors are urged to read the  registration
statement  and other  materials  when they are  available  because  they contain
important  information.  Investors  will be able to  obtain  free  copies of the
registration statement and proxy statement,  when they become available, as well
as other filings containing  information about Pinnacle Entertainment and Aztar,
without charge, at the SEC's Internet site (HTTP://WWW.SEC.GOV). These documents
may also be obtained  for free from  Pinnacle by directing a request to Pinnacle
Entertainment,  Inc.,  3800 Howard  Hughes  Parkway,  Las Vegas,  Nevada  89109,
Attention: Investor Relations. Free copies of Aztar's filings may be obtained by
directing a request to Aztar  Corporation,  2390 East Camelback Road, Suite 400,
Phoenix, Arizona 85016, Attention:  Secretary.

ADDITIONAL INFORMATION AND WHERE TO FIND IT

This  press  release  may be deemed to be  solicitation  material  in
respect of the proposed  merger of Aztar and Pinnacle.  In  connection  with the
proposed merger,  Aztar plans to file a proxy statement with the SEC.  INVESTORS
AND SECURITY  HOLDERS OF AZTAR ARE ADVISED TO READ THE PROXY  STATEMENT  AND ANY
OTHER RELEVANT  DOCUMENTS FILED WITH THE SEC WHEN THEY BECOME AVAILABLE  BECAUSE
THOSE DOCUMENTS WILL CONTAIN  IMPORTANT  INFORMATION  ABOUT THE PROPOSED MERGER.
The final proxy statement will be mailed to stockholders of Aztar. Investors and
security holders may obtain a free copy of the proxy statement, when it becomes
available,  and other  documents  filed by Aztar with the SEC,  at the SEC's web
site at HTTP://WWW.SEC.GOV.  Free copies of the proxy statement, when it becomes
available,  and Aztar's  other  filings  with the SEC may also be obtained  from
Aztar.  Free copies of Aztar's filings may be obtained by directing a request to
Aztar Corporation,  2390 East Camelback Road, Suite 400, Phoenix, Arizona 85016,
Attention:  Secretary.

Aztar,  Pinnacle and their respective  directors,  executive  officers and other
members of their management and employees may be deemed to be soliciting proxies
from Aztar's stockholders in favor of the proposed merger. Information regarding
Aztar's directors and executive officers is available in Aztar's proxy statement
for its 2006  annual  meeting of  stockholders,  which was filed with the SEC on
April  10,  2006.  Information  regarding  Pinnacle's  directors  and  executive
officers is available in Pinnacle's  proxy statement for its 2006 annual meeting
of  stockholders,  which was filed  with the SEC on April 13,  2006.  Additional
information  regarding  the  interests of such  potential  participants  will be
included in the proxy statement and the other relevant  documents filed with the
SEC when they become available.