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In reality, playing through the game with a single character is quite a challenge.
As a Knight.
At first, I thought you could only do it with a Mage, but no. It turns out that the Knight isn't that bad either. Of course, it's not as easy in open spaces as it is for a Mage, but at least in enclosed areas, you won't get one-shotted from behind.
The game has given me a whole new experience: running back and forth 5 times to the chests in the town (you have to take out all the junk, otherwise you'll run out of money); you can't just run into a crowd of mobs and kill them all, they'll just kill you without even noticing. You have to: run up, hit, run away, drink a potion, use a scroll, run up, hit, run to the other side, hit again. It's quite intense.
I've started using scrolls and potions constantly (if I find a decent one), and that takes up inventory space, and I only have one inventory.
So, you go on a trip to fight wolves, and you stock up on potions and scrolls. During the battle, your inventory gradually empties, and you have more space for loot.
Then, in town, you sell all the trophies to the store and buy new ones: wands, scrolls, bottles (a new problem has emerged: the stores don't update as often). And then you go on another trip, but don't forget to stop by the church for a blessing, and be sure to take a yellow potion, as they also apply a speed debuff, which wears off quickly, and a tired warrior is no warrior at all, especially when he's alone in the field.
In the end, it's fun, but it takes a lot more time.