SuperTux

SuperTux is a 2004 2D open-source platform-adventure video game that was originally created by Bill Kendrick in 2004, and is currently being maintained by a team under the name of "SuperTux Development Team". The game is heavily inspired by Nintendo's Super Mario Bros. series.

Gameplay
Instead of Mario, the game stars Tux the Penguin as the protagonist, who has to save his girlfriend, Penny, from Nolok, who seems to be inspired/based off by/of Bowser.

The core gameplay is similar to that of the Super Mario Bros. games. Tux can jump under bonus blocks and get power-ups/coins from them, such as a fire power-up that functions similar to the Fire Flower from the aforementioned game. and as well as stomp on enemies. At the end of each world, there is a boss, and eventually, the player will fight Nolok himself at the end of the game and rescue Penny.

Why It Rocks

 * 1) Despite being too similar to Super Mario Bros. for the most part, it's a pretty good clone of said game, even for an open-source one.
 * 2) Just like Mario, the controls are very tight and responsive, but can also be challenging to master, given that they were made to closely resemble the controls from the mainline Mario games.
 * 3) The graphics and art style look pretty nice and go well with the game's platforming genre and the theme/tone of the game, given that it was drawn by Ingo Ruhnke, the artist for Pingu, another open-source game starring Tux.
 * 4) Similar to SuperTuxKart, the game even has a level editor where you can make custom levels in-game, and as well as install addon levels that were entirely custom-made by the community.
 * 5) The soundtrack is surprisingly great for an open-source game, and thankfully, most of it is original, instead of it just using royalty free music like other games.
 * 6) Adding onto WIR #4, there are also contributed Bonus levels that were released and added to the game in order to celebrate the game's 20th year anniversary, adding even more content to the game, which is a nice touch.
 * 7) The game is available on over 15 platforms, including consoles! (mostly homebrew) However, the console versions usually don't get as many updates as the PC versions, as stated in BQ #1.
 * 8) The game finally lets you fight Nolok himself in later versions of the game, unlike in Milestone 1, as in that version, the game ended on a weird cliffhanger.
 * 9) The game surprisingly has a decent length that expands with each newly released versions, as it can be beaten in about 5 hours.
 * 10) Unlike Mario, there is a chance of you getting an extra life from an item box, rather than you having to collect 100 coins.

Bad Qualities

 * 1) The console versions don't get as many updates as the PC and Android versions, such the Wii version, which hasn't even been updated for over 10 years, even though it says that Milestone 2 is "coming soon".
 * 2) Although the game is great, it doesn't have as many distinct elements from the game it's based off of/inspired by compared to SuperTuxKart.
 * 3) Milestone 1 ended on a cliffhanger, where it is revealed that Penny is in another fortress, which is very disappointing, as the player had to go through 26+ levels just to get this ending. Thankfully, in newer versions, you can actually fight Nolok now.

Reception
In 2007, Punto Informatico described the atmosphere of the game as pleasant and also praised the game's free availability.

In 2008, SuperTux was used as a game for children in schools, along with SuperTuxKart, and was pre-installed on student's laptops.

Although there has been some criticism made on the game for it being too similar to Mario, people still found the game to be enjoyable enough, and that it can even serve as a decent alternative to Mario for open-source users.

Videos
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