EXHIBIT 99.12

                          LEVEL 3 COMMUNICATIONS, INC.

                                 Exchange Offer
                               to holders of its
                     12 7/8% Senior Discount Notes due 2010

                         NOTICE OF GUARANTEED DELIVERY

  As set forth in the Prospectus dated       , 2000 (the "Prospectus") of Level
3 Communications, Inc. (the "Company") under "The Exchange Offer--How to
Tender" and in the Letter of Transmittal (the "Letter of Transmittal") relating
to the offer (the "Exchange Offer") by the Company to exchange up to
$675,000,000 in principal amount at maturity of its 12 7/8% Senior Discount
Notes due 2010 (the "New Notes") for $675,000,000 in principal amount at
maturity of its 12 7/8% Senior Discount Notes due 2010, issued and sold in a
transaction exempt from registration under the Securities Act of 1933, as
amended (the "Original Notes"), this form or one substantially equivalent
hereto must be used to accept the Exchange Offer of the Company if: (i)
certificates for the Original Notes are not immediately available; or (ii) time
will not permit all required documents to reach the Exchange Agent (as defined
below) on or prior to the expiration date of the Exchange Offer (as described
in the Prospectus). Such form may be delivered by hand or transmitted by
telegram, telex, facsimile transmission or letter to the Exchange Agent.

   TO: The Bank of New York (the "Exchange Agent")

                                 By Facsimile:
                                 (212) 815-6339

                             Confirm by telephone:
                                 (212) 815-2742

                        By Registered or Certified Mail:
                              The Bank of New York
                             101 Barclay Street, 7E
                            New York, New York 10286
                            Attention: Enrique Lopez

                        By Overnight Courier or By Hand:
                              The Bank of New York
                               101 Barclay Street
                        Corporate Trust Services Window
                                  Ground Level
                            New York, New York 10286
                            Attention: Enrique Lopez

              Delivery of this instrument to an address other than
            as set forth above or transmittal of this instrument to
              a facsimile or telex number other than as set forth
                   above does not constitute a valid delivery.


   Ladies and Gentlemen:

   The undersigned hereby tenders to the Company, upon the terms and conditions
set forth in the Prospectus and the Letter of Transmittal (which together
constitute the "Exchange Offer"), receipt of which are hereby acknowledged, the
principal amount at maturity of Original Notes set forth below pursuant to the
guaranteed delivery procedure described in the Prospectus and the Letter of
Transmittal.



                                                        Sign Here

Principal Amount at Maturity of           Signature(s) ________________________
Original Notes                            _____________________________________

Tendered ________________________

                                          Please Print the Following
Certificate Nos.                          Information

                                          Name(s) _____________________________
(if available) __________________

                                          _____________________________________
Total Principal Amount at Maturity        Address _____________________________
Represented by Original Notes             _____________________________________

Certificate(s) __________________

                                          Area Code and Tel. No(s). ___________
Account Number __________________

                                          -------------------------------------
Dated: ____________________, 2000

                                       2


                                   GUARANTEE

   The undersigned, a member of a recognized signature guarantee medallion
program within the meaning of Rule 17A(d)-15 under the Securities Exchange Act
of 1934, as amended, hereby guarantees that delivery to the Exchange Agent of
certificates tendered hereby, in proper form for transfer, or delivery of such
certificates pursuant to the procedure for book-entry transfer, in either case
with delivery of a properly completed and duly executed Letter of Transmittal
(or facsimile thereof) and any other required documents, is being made within
three trading days after the date of execution of a Notice of Guaranteed
Delivery of the above-named person.

                                 Name of Firm _________________________________
                                 Authorized Signature _________________________
                                 Number and Street or P.O. Box ________________
                                 ______________________________________________
                                 City            State     Zip Code ___________
                                 Area Code and Tel. No. _______________________

   Dated:              , 2000

                                       3