The second title in Midway's baseball series, SlugFest 20-04 continues to pour on the rough-housing gameplay, bizarre codes, and humorous commentary. In addition to the new Home Run Derby mode and Create-A-Team options, the game features the ability of pitchers to catch "On Fire" and impossible Special Pitches that zigzag, arc, and whizz by in ways that would leave any batter humiliated. New secret teams have been added to the previous bunch, including aliens, minotaurs, and Sub-Zero of Mortal Kombat fame. The customizable Instant Replay is another nice touch, allowing you to relive the awkward moments once you pause the game. And, of course, Tim Kitzrow and Jim Shorts return to the commentators' booth, making their signature random comments and incessant arguments.

MLB SlugFest 20-04 is the only appearance of Midway's arcade baseball series on the Game Boy Advance. Compared to the console version, it has a reduced number of gameplay modes and options and features traditional two-dimensional graphics.

Gameplay modes include Quick Play for a single exhibition match, Challenge (similar to a season, with one game against every team) and Series (best-of-7 World Series match). Progress in Challenge and Series modes is saved via passwords. The game includes licensed teams and players from the 2003 MLB season, along with six different ballparks.

Gameplay largely follows the traditional model: pitching and batting are seen from a view behind the batter, while the view switches to an isometric view of the field once the ball is away. The standard features of Midway's sports games can also be found here: players have a turbo meter that can be used to enhance their moves, and they can catch on fire after several successful plays, enhancing their abilities even further.

Midway's first extreme sports title that tackles the great American past-time... baseball. Take control of all of your favorite Major League Baseball teams and players armed with all of their real stats, attributes, abilities and attitude. Slugfest features many playable minigames, a season mode, quick play and exhibition play.

So what makes MLB Slugfest extreme? The game is far from a real baseball simulation. This is as arcade as it gets. Flaming fastballs that take out batters ankles (and reducing their stats), out-of-the-park home runs, dropkicking the catcher on your dash to home plate, kidney punching the batter who just ruined your no-hitter and many other brutal tactics bring sportsmanship to an all-new low.

Graphic touches include real player faces and details such as chewing gum and talking to teammates or opponents. Real stadiums all make their appearances along with several fantasy stadiums that can be unlocked.

Busting through a brick wall, Rhino charges the Hulk. KRAASH! As the Rhino closes in, the Hulk prepares to knock him to oblivion. The Hulk lands a gamma-powered uppercut! THWAAP! Bruce Banner contends with The Leader's Robot Warriors' laser blasts. THKOOM! The Leader's Bio-Tech Mutants hurl at the angry Hulk. AAAARRRGGG!!