David Barr and me has writen a Last Layer trainer for the 3x3 guess this was in the year 2006. You can train a few diffrent methods for the Last Layer like: CFOP OLL/PLL, COLL, ZBLL. The idea came up like: I know the main key is F2L but when your LL is not that good you have to practise that.
This is the LL-trainer V 1.9.1
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