I faced him when I was about lv.20. I tried to shoot him with the shotgun, but this did very little damage to him and still I was vulnerable from his ranged attacks. Getting close to him was impossible, I couldn't do not even a scratch to him and I died very quickly. Eventually after three tries, I decided to skip it for my second playthrough. Do you have any ideas how to deal with this boss? Do I need an extra powerful moddified ranged weapon? Thanks.
i found a really easy way to beat him. i was about level 11 or 12 when i did this. just try to stay alive while u run back to the gun store, then take a sniper and then hide behind the counter furthest away from the door. then just wait for slappy to come to the door and then snipe him. his fireball will either NOT reach you at all, or it will only blow you away (and does no damage!). i killed him like this in about 10 minutes
Baseball Game - Pro Yakyu Spirits (PS3/PSP/PS2) Translation www.SpiritsTranslation.com
I am skipping him (or rather did skip) him for my second playthrough.
However I have recently started using Painkiller drinks. Basically find a blender (one in Shots & Awe in Americana Casino [hope I got that name right]) and mix one beer with another beer and a painkiller drink will pop out. I actually just stood there in front of some bosses and took the damage - the amount of damage it reduces is insane.
"My name is Spartan Jay, the best Modern Warfare 2 player of all time. Because I am on your team, this team will win" ~ Spartan Jay
It took me multiple tries until I succeed in killing him. I was level 23 when I faced him.
Once the cutscene ended, jump down to the 1st floor. I had a much more easy time facing him at a open space. the zombies around will help to take the damage for u haha.
Slappy will shoot at you 2 to 3 times, than rush toward you with his 2 flame throwers. try not to get hit by running around the zombies. wait til Slappy fall to the ground, than you can go and wrack the hell out of him :)
I'm using the bat with spike nail :).
Oh by the way, enjoy the cutscene after you manage to beat Slappy XD So Sad and touching LOL