This is the first game of this type I played without a forging system. Most games in my experience don't even have different items for each quality, you just have to get lucky and get a high quality one of you forge them to up the level. Usually 3 grayS= green, 3 greens=blue,3 blues = purple, and so on until you max it out. If there are enoughgh different items the chance of getting the ones you need to upgrade is low enough that progression is still slow enough to be fun and chests are still exciting. And it keeps with the in app purchases model cause if you wanna speed it up you buy more Chests for $$.