Talk:The Memory Traveler/@comment-100.15.225.12-20161028154026/@comment-3083005-20161028154955

Normally you can only get PR mats like the memory traveller in the black hole. Occasionally there will be a special one-off stage that drops a PR mat, and sometimes there will be a purchase reward where you will get a PR mat as reward for buying diamonds. But this happens quite rarely and in practice you must rely on the Black Hole for PR mats.