Robert Downey Jr. turned 54 on Thursday, and he chose to celebrate with a puzzling tweet ― literally.
The actor posted a crossword puzzle with clues related to his life and career.
The clue for 4 Down ― “22 days ...” is key, since that’s the number of days before “Avengers: Endgame ” hits theaters on April 26.
Downey also marked the big 5-4 on Instagram by posting an illustration of Avengers celebrating Iron Man’s birthday.
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BuzzFoto Celebrity Sightings In New York City- April 30, 2013 NEW YORK, NY - APRIL 30: Robert Downey Jr. leaves Gemma restaurant on April 30, 2013 in New York City. (Photo by Josiah Kamau/BuzzFoto/FilmMagic)
Celebrity Sightings In New York City - April 30, 2013 NEW YORK, NY - APRIL 30: Actress Robert Downey Jr. visits 'The Daily Show with Jon Stewart' on April 30, 2013 in New York City. (Photo by Raymond Hall/FilmMagic)
Celebrity Sightings In New York City - April 30, 2013 NEW YORK, NY - APRIL 30: Actor Robert Downey Jr. visits 'The Daily Show with Jon Stewart' on April 30, 2013 in New York City. (Photo by Raymond Hall/FilmMagic)
Celebrity Sightings In New York City - April 30, 2013 NEW YORK, NY - APRIL 30: Actress Robert Downey Jr. visits 'The Daily Show with Jon Stewart' on April 30, 2013 in New York City. (Photo by Raymond Hall/FilmMagic)
Celebrity Sightings in New York - April 30, 2013 NEW YORK, NY - APRIL 30: Actor Robert Downey, Jr. is seen on April 30, 2013 in New York City. (Photo by DVT/Star Max/FilmMagic)
BuzzFoto Celebrity Sightings In New York City- April 29, 2013 NEW YORK, NY - APRIL 29: Robert Downey Jr. appears on 'Good Morning America' on April 29, 2013 in New York City. (Photo by Josiah Kamau/BuzzFoto/FilmMagic)
Celebrity Sightings In New York City - April 29, 2013 NEW YORK, NY - APRIL 29: Actor Robert Downey Jr. leaves the 'Good Morning America' taping at the ABC Times Square Studios on April 29, 2013 in New York City. (Photo by Ray Tamarra/Getty Images)
ABC's "Good Morning America" - 2013 GOOD MORNING AMERICA - Robert Downey Jr. is a guest on 'Good Morning America,' 4/29/13, airing on the ABC Television Network on the ABC Television Network. (Photo by Donna Svennevik/ABC via Getty Images) GEORGE STEPHANOPOULOS, ROBERT DOWNEY JR.
ABC's "Good Morning America" - 2013 GOOD MORNING AMERICA - Robert Downey Jr. is a guest on 'Good Morning America,' 4/29/13, airing on the ABC Television Network on the ABC Television Network. (Photo by Donna Svennevik/ABC via Getty Images) ROBERT DOWNEY JR.
ABC's "Live With Kelly And Michael" - 2013 LIVE WITH KELLY AND MICHAEL -4/30/13 - Robert Downey Jr., is a guest on 'LIVE with Kelly and Michael,' distributed by Disney-ABC Domestic Television. (Photo by David Russell/Disney-ABC via Getty Images) ROBERT DOWNEY JR.
ABC's "Live With Kelly And Michael" - 2013 LIVE WITH KELLY AND MICHAEL -4/30/13 - Robert Downey Jr., is a guest on 'LIVE with Kelly and Michael,' distributed by Disney-ABC Domestic Television. (Photo by David Russell/Disney-ABC via Getty Images) ROBERT DOWNEY JR.
Robert Downey Jr. Rings The NYSE Opening Bell In Celebration Of "Iron Man 3" NEW YORK, NY - APRIL 30: Robert Downey Jr. rings the opening bell at the New York Stock Exchange on April 30, 2013 in New York City. (Photo by Steve Mack/FilmMagic)
Robert Downey Jr. Rings The NYSE Opening Bell In Celebration Of "Iron Man 3" NEW YORK, NY - APRIL 30: Robert Downey Jr. rings the opening bell at the New York Stock Exchange on April 30, 2013 in New York City. (Photo by Steve Mack/FilmMagic)
Robert Downey Jr. Rings The NYSE Opening Bell In Celebration Of "Iron Man 3" NEW YORK, NY - APRIL 30: Robert Downey Jr. rings the opening bell at the New York Stock Exchange on April 30, 2013 in New York City. (Photo by Steve Mack/FilmMagic)
Robert Downey Jr. Rings The NYSE Opening Bell In Celebration Of "Iron Man 3" NEW YORK, NY - APRIL 30: Actor Robert Downey Jr rings the opening bell at New York Stock Exchange on April 30, 2013 in New York City. (Photo by Taylor Hill/Getty Images)
Robert Downey Jr. Rings The NYSE Opening Bell In Celebration Of "Iron Man 3" NEW YORK, NY - APRIL 30: Actor Robert Downey Jr rings the opening bell at New York Stock Exchange on April 30, 2013 in New York City. (Photo by Taylor Hill/Getty Images)
Robert Downey Jr. Rings The NYSE Opening Bell In Celebration Of "Iron Man 3" NEW YORK, NY - APRIL 30: Actor Robert Downey Jr rings the opening bell at New York Stock Exchange on April 30, 2013 in New York City. (Photo by Taylor Hill/Getty Images)
Robert Downey Jr. Rings The NYSE Opening Bell In Celebration Of "Iron Man 3" NEW YORK, NY - APRIL 30: Actor Robert Downey Jr rings the opening bell at New York Stock Exchange on April 30, 2013 in New York City. (Photo by Taylor Hill/Getty Images)
"Iron Man 3" - Los Angeles Premiere - Arrivals HOLLYWOOD, CA - APRIL 24: Actor Robert Downey, Jr. and wife Susan Downey arrive at the 'Iron Man 3' - Los Angeles Premiere at the El Capitan Theatre on April 24, 2013 in Hollywood, California. (Photo by Allen Berezovsky/WireImage)
"Iron Man 3" - Los Angeles Premiere - Arrivals HOLLYWOOD, CA - APRIL 24: Actor Robert Downey, Jr. and wife Susan Downey arrive at the 'Iron Man 3' - Los Angeles Premiere at the El Capitan Theatre on April 24, 2013 in Hollywood, California. (Photo by Allen Berezovsky/WireImage)
"Iron Man 3" - Los Angeles Premiere - Arrivals HOLLYWOOD, CA- APRIL 24: Actor Robert Downey Jr. arrives at the 'Iron Man 3' - Los Angeles Premiere at the El Capitan Theatre on April 24, 2013 in Hollywood, California.(Photo by Jeffrey Mayer/WireImage)
"Iron Man 3" - Los Angeles Premiere - Arrivals HOLLYWOOD, CA- APRIL 24: Actor Robert Downey Jr. and wife Susan Downey arrive at the 'Iron Man 3' - Los Angeles Premiere at the El Capitan Theatre on April 24, 2013 in Hollywood, California.(Photo by Jeffrey Mayer/WireImage)
"Iron Man 3" - Los Angeles Premiere - Arrivals HOLLYWOOD, CA- APRIL 24: Actor Robert Downey Jr. arrives at the 'Iron Man 3' - Los Angeles Premiere at the El Capitan Theatre on April 24, 2013 in Hollywood, California.(Photo by Jeffrey Mayer/WireImage)
"Iron Man 3" - Los Angeles Premiere - Arrivals HOLLYWOOD, CA- APRIL 24: Actor Robert Downey Jr. (R) and wife Susan Downey arrive at the 'Iron Man 3' - Los Angeles Premiere at the El Capitan Theatre on April 24, 2013 in Hollywood, California.(Photo by Jeffrey Mayer/WireImage)
"Iron Man 3" - Comic-Con International 2012 Robert Downey Jr. en el pánel de "Iron Man 3" durante Comic-Con International 2012 en el San Diego Convention Center el 14 de julio, 2012 en San Diego, California. (Kevin Winter/Getty Images)
"Iron Man 3" El director Shane Black, y los actores Robert Downey Jr., y Jon Favreau en el San Diego Convention Center. (Kevin Winter/Getty Images)
"Iron Man 3" Robert Downey Jr. y Don Cheadle durante la conferencia de la cinta. (Kevin Winter/Getty Images)
Comic-Con International 2012 Robert Downey Jr. en el pánel de "Iron Man 3" durante Comic-Con International 2012 en el San Diego Convention Center el 14 de julio, 2012 en San Diego, California. (Kevin Winter/Getty Images)
Comic-Con International 2012 Robert Downey Jr. durante Comic-Con 2012 en el San Diego Convention Center el 14 de julio de 2012 en San Diego, California. (Kevin Winter/Getty Images)
Comic-Con International 2012 Robert Downey Jr. jugando con el micrófono. (Kevin Winter/Getty Images)
"Iron Man 3" Robert Downey Jr. en el pánel de "Iron Man 3" durante Comic-Con International 2012 en el San Diego Convention Center el 14 de julio, 2012 en San Diego, California. (Kevin Winter/Getty Images)
Comic-Con International 2012 Jugando con el guante del superhéroe. (Kevin Winter/Getty Images)
Comic-Con International 2012 Robert Downey Jr. bromeando con Don Cheadle. (Kevin Winter/Getty Images)
"Marvel's The Avengers" Premiere Robert Downey Jr. presenta "The Avengers" en la edición 2012 del Festival de Cine de Tribeca, el 28 de abrilk de 2012. (Slaven Vlasic/Getty Images)
"Marvel's The Avengers" Premiere Posando para la prensa en el Festival de Tribeca en New York. (Slaven Vlasic/Getty Images)
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