Lumo

If you are following the first YouTube playlist linked above, you will be getting all collectibles including the 6 bonus letters. Unlike the other collectibles, the letters (E, X, T, E, N, D) are tied to minigames, which are accessed by entering the Warp Zone. In order to access the Warp Zone, you have to find specific doors (except for the first time when you’ll enter it during a cutscene), and you need to carry at least 10 coins with you to play a minigame (there are 60 coins to collect throughout the game and 6 minigames to play).

When you enter the Warp Zone, you’ll be standing on a large circular platform surrounded by 6 smaller platforms each leading to a different minigame. Starting from the bottomish-left platform and moving in a clockwise fashion, the platforms lead to the E, X, T, E, N and D minigames respectively. Make sure you start with the two E minigames when you enter the Warp Zone for the first 2 times or else you’ll miss out on Sorted For E's And... .

After crossing one of the 6 platforms, you’ll enter a room with various obstacles, which you’ll have to pass to finally access the minigame. It is highly recommended you back-up your save file as soon as you enter the room before the minigame since you only get one shot at the minigame and, if you fail, you will not be able to get the associated letter nor the associated trophies until your next playthrough. This trophy will pop at the end of the playthrough when the “EXTEND” word appears on the screen.

If you need more info about each minigame, please check the following trophies’ descriptions: Zax On, Zax Off , Dicey , Pogo , Cerny Method , Bounder and Qbrill .