The regular game of LR had 150 levels and allowed you to create a user disk for 150 custom levels. I can't remember if the Apple version allowed you to add lives, but you could flip into the game editor on either disk and start at any level. The game had to be played in one sitting, since there was no way to save your game.
Championship LR was made of the 50 toughest homemade levels (I think that the box stated that) and has no editor. It allowed you to practice any of them, though. When in the regular game mode, you could save your progress to reload later. The price for this ability was losing one of your lives when it was reloaded, so an easy way to increase your chances was to save the game multiple times (I think that it had 10 save slots).