Launch any hero boat "In town"
For example, You launch your "The Contract" hero boat in town.
Step 2.
Click the "Boat info" right next to "Enter" button.
Then it will show you boat information you launched.
For this case, you will see Hero level "The Contract" battle.
Step 3.
Press "N" to load another battle list on the right.
Then you can see the "Create Party" button.
Press that.
Step 4.
Press Any battle on the list.
For example, I pressed "The Giant"
Step 5.
"Create Party" tab shows "The Giant" battle info.
Then Click Hard or Normal Difficulty.
Step 6.
Don't click "Create Party" button.
Just Click "Enter" button.
Step 7.
Your boat probably launch with Hero mark.
Done.
Your battle launched as Hero battle but you will not see any NAMED monsters in battle and they are pretty weak as Normal / Hard level Monsters.
But Reward(Reward money, Cores, Enchant, Elixir) is still HERO LEVEL ONES.
Not my tutorial. Some of you already know this. But obviously you would want only normal mode. Be warned, you WILL get a perma/temp ban within an hour. Happy farming =D