One trial, the one involving Bahamut, is only accessible 1-time and if you miss the destruction puzzle treasure you won't be able to obtain it again. The item isn't necessary but unlocking is. Each trial has an optional puzzle using a destruction sphere that unlocks a treasure chest. During the game, you're required to complete trials to earn summons.

This is a spoiler but the last thing you want to do is have to repeat the entire game. Trying to obtain them for others without finishing the set path will lead to a lot of painful battles.

Those abilities, like others, are easily accessible to their default paths. The last thing you want is to have Auron without his armor break or Tidus without Haste. When you reach the end the game will lock the path with a level specific node. Instead, follow the specific path set for you. These abilities are usually limited to specific characters but it's unwise to try to obtain these during the beginning of the game. Later on, in Final Fantasy X players can venture outside the Sphere Grid to earn powerful abilities. It's prudent for you to gain enough levels until the enemies start providing about 10% of the total experience needed to level up. This includes Haste, Fira, and even specific amounts of health. The developers have ensured that each section of the game takes advantage of abilities you should have access to. If you're too low, get ready to die a lot. Seems basic but Final Fantasy X leveling system is very rigid. Here are helpful tips to make your journey through Spira a lot easier. This decade-old title still holds up today but those diving into the adventure for the first time will be a bit lost. Final Fantasy X releases this week on Xbox One and Nintendo Switch.

Final fantasy 10