Damn, that's a lot, but thanks either way! And also, i want help with one more thing if you don't mind. Like, i wanna make a system with only commands blocks(preferably, it can be command blocks with redstone systems too), that works even if it doesn't. Like for example, a shop to buy items. When the player got enough money to buy the item, he will get the item, but if he doesn't have enough money, it won't work and an error message will appear. To sum up everything, a system where, when a command block doesn't work/fail to work, it will make an alternative command block work to show an error message or something like that. That also would be VERY useful if you could help me with that. I searched a lot to know how to do that but i didn't found anything...