I had a disagreement with a fellow player on how spells are gained each level.
I understand that spells have to be found (like on scrolls, at magic shops for lower level, etc)
But the way I read the rules is:
Upon obtaining a new level, the mage is able to learn that level in NEW spells. So when a wizard moves from, say, 3rd level to 4th level he may opt to:
1. Learn a 4th level spell
2. Learn a 3rd and a 1st level spell
3. Learn two 2nd level spells
4. Learn four 1st level spells.
(all providing he has the scrolls or access to a wizard's shop, etc).
In addition to the spells he had gained from 1, 2 and 3rd levels.