Beyond all questions, although Super Mario Bros. 3 is only the third work of Super Mario series released on FC platform (in 1988 by Nintendo), it's the best and most playable one in the whole series, with perfect graphics design and fascinating background music.
Wario Land 3 is one work in the series of Wario Land developed by Nintendo. This one is for SEGA Menga Drive, different from the one (ワリオランド3 不思議なオルゴール, Wario Land 3: Fushigi na Orgel, Wario Land 3: The Mysterious Music Box) you played on Game Boy Color (GBC) and 3DS Virtual Console platforms.
Super Mario 64 (AKA: スーパーマリオ64) was developed by Nintendo for Nintendo 64 platform in 1996, just appeared on the market along with Nintendo 64 console in Japan. Meanwhile, it was also the first video game with 3D modeling, which laid a foundation for later 3D games on gameplay.
Super Mario Bros. X (short for SMB-X or SMBx) is an excellent fan-made game originally developed by Andrew Sprinks (screen name: Redigit). It blended all the classic elements of Super Mario 1, 2, 3 and World along with many new added practical props, such as Ice Flower, Hammer Suit, Tanooki Suit, Kuribo's shoe, The Billy Gun, Yoshi, and more.
Mario & Luigi: Bowser's Inside Story (AKA: Mario & Luigi RPG 3!!!, マリオ&ルイージRPG3!!!, Mario ando Ruīji Āru Pī Jī Surī, 瑪利歐與路易吉RPG3!!!) is an RPG type of video game released by Nintendo for NDS handheld game console in 2009. As the third work in the Mario & Luigi RPG series, the former two are Mario & Luigi: Superstar Saga and Mario & Luigi: Partners in Time.
Super Mario RPG: Legend of the Seven Stars (short for SMR, ANA: スーパーマリオRPG in Japan) is a co-production made by the two game industry giants Nintendo and Square Enix for SNES game console in 1996. It is also the first RPG type of work in the whole Super Mario Bros. series.
Since Nintendo entering the N64 platform, the orthodox Super Mario series games had stepped into its 3D era, the graphics and gameplay were all converted to the stereoscopic 3D from the previous plane 2D.