Nintendo began printing the Metroid Prime Trilogy on disc for the Wii in 2009, but it was discontinued only 3 months after; the only other official release of the Trilogy since then has been as a download for the Wii U via Virtual Console in 2015. This makes the physical Trilogy very hard to find, and a prize item for collectors.
The Nintendo Wii ports of Metroid Prime (2002) and Metroid Prime 2: Echoes (2004) in this trilogy are based on Wii ports of the games that were developed and sold separately in Japan as 'New Play Control!' versions, but were never released outside of Japan.
The Metroid Prime (2002) and Metroid Prime 2: Echoes (2004) games in this trilogy have three new difficulty settings, called 'Normal mode', 'Veteran Mode' and 'Hypermode'. In reality, Normal mode is the only new one, and can be considered an 'Easy' setting. Veteran mode and Hypermode correspond to the respectively 'Normal' and 'Hard' settings from the original games. Other new additions include a Bonus Credit system that unlocks bonus features in these games, similar to Metroid Prime 3: Corruption (2007).
A Nintendo Switch version of this trilogy was considered, but was deemed unfeasible. While adapting Metroid Prime (2002) and Metroid Prime 2: Echoes (2004) to Switch controls would be relatively straightforward, Retro Studios can no longer edit the original game code of Metroid Prime 3: Corruption (2007), meaning that this game would have to be re-build from the ground up at considerable expense of man-hours.
The game features Nintendo Wii ports of the GameCube titles Metroid Prime (2002) and Metroid Prime 2: Echoes (2004), offering a first-time ability to play these games with separate controls for locking onto objects and aiming the firing cursor (similar to the gameplay in Metroid Prime 3: Corruption (2007)). In the original GameCube versions, locking onto objects automatically aimed the cursor at said objects, with no option to fire elsewhere.