Haha, I've had a few worlds that have been like that. I mean, exactly like that. And I even saw one with 3 squares, the third square was an
invincibility geopanel, so the level was impossible to complete.
This took yesterday afternoon, all night, all morning, and half of today to complete:
Maxed transmigration for Shamgi (Paladin), who now has 210 bonus points. This required me to get to above level 700, promotion rank 3 times, transmigrate, and repeat. Instead of stopping at level 700 each time I just continuously grinded while watching tv, then transmigrated. I boosted INT fully (240 max) and the rest into HP.
And this is the result. I had to grind to 9999 twice - once so I could transmigrate at 9999 for the full yellow bar boost - and once to reach 9999 and stay like that forever.
I don't plan on doing this for any other character. Period. Although Shamgi no longer needs levels, I'm not done yet. I still need to get the best items and more Teachers.
Actually I might take a break from Disgaea for a few days. This was overkill.