1986: Metroid
1986: Kid Icarus (Metroids appear)
1991: Metroid II: Return of Samus
1991: Kid Icarus: Of Myths and Monsters (Metroids appear)
1994: Super Metroid
1996: Super Mario RPG: Legend of the Seven Stars (minor Samus cameo)
1998: Wario Land II (minor cameo by a Metroid)
1999: Super Smash Bros. (Samus is playable and there is a Metroid stage)
2001: Super Smash Bros. Melee (Samus is playable and there are multiple Metroid stages)
2006: Tetris DS (Samus appears in various modes)
2008: Super Smash Bros. Brawl (Samus is playable and there are multiple Metroid stages)
2011: Puzzle Swap (Samus cameos in multiple puzzles)
2012: Kid Icarus: Uprising (Metroids appear)
2012: Animal Crossing: New Leaf (Metroids appear)
2012: Nintendo Land (a new game, Metroid Blast, is included)
Related Series:
Kid Icarus
Super Mario
Wario
Super Smash Bros.
Animal Crossing
Mii games
1986: Kid Icarus (Metroids appear)
1991: Metroid II: Return of Samus
1991: Kid Icarus: Of Myths and Monsters (Metroids appear)
1994: Super Metroid
1996: Super Mario RPG: Legend of the Seven Stars (minor Samus cameo)
1998: Wario Land II (minor cameo by a Metroid)
1999: Super Smash Bros. (Samus is playable and there is a Metroid stage)
2001: Super Smash Bros. Melee (Samus is playable and there are multiple Metroid stages)
2006: Tetris DS (Samus appears in various modes)
2008: Super Smash Bros. Brawl (Samus is playable and there are multiple Metroid stages)
2011: Puzzle Swap (Samus cameos in multiple puzzles)
2012: Kid Icarus: Uprising (Metroids appear)
2012: Animal Crossing: New Leaf (Metroids appear)
2012: Nintendo Land (a new game, Metroid Blast, is included)
Related Series:
Kid Icarus
Super Mario
Wario
Super Smash Bros.
Animal Crossing
Mii games