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Until someone makes better resources, [FAQ Builder] threads are for organizing FAQs—be cool and contribute to them. See [FAQ Building.](http://www.kongregate.com/forums/190-ninja-warz/topics/298481)
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1. **How many blood types** are there? 8
2. **What are the blood types?**
3. What blood type is a [universal recipient?](http://en.wikipedia.org/wiki/Blood_type#Universal_donors_and_universal_recipients) AB+
4. What blood type is a [universal donor?](http://en.wikipedia.org/wiki/Blood_type#Universal_donors_and_universal_recipients) O-
5. Are **some blood types more rare** than others? [Yes.](http://www.bloodbook.com/world-abo.html)
6. I mean in the game, smart ass. Oh, well, uh, yeah, it seems that some types are more rare than others. Most people say that AB+, O-, and AB- are the most difficult to find.
7. That’s nice, but what is the relative rarity? I don’t know. _Maybe someone else has some definitive numbers on this._ Please?
8. What does the blood type affect? At the very least, there are many [achievements](http://ninjawarz.wikia.com/wiki/List_of_Achievements) (for a ton of Karma) related to blood type.
9. Does it affect anything else? Not that I know of. _Does anyone know for sure?_
10. \*Does blood type affect the cost of healing at the Hospital?( Logically, it would make sense, but I don’t know and I have not read anything definitive. _Does anyone know for sure?_
11. Does it affect mosquitoes? [Yes.](http://www.straightdope.com/columns/read/2891/do-mosquitoes-prefer-certain-blood-types-plus) But if there are mosquitoes in this game, they are too small for me to see.
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Please ask questions and add answers to this thread. **There are multiple unanswered questions in this topic, if you know the answer, _and have proof_, please post the answer and the source of your proof. Thanks!**
if blood type does affect healing cost
AB+ would be cheapest
but this is hard to test since the hp needs to be at a control and you heal every second so timing needs to be perfect and the amount you heal isnt even constant
> *Originally posted by **[b0b44](/forums/190/topics/298573?page=1#posts-6410907):***
> I have never seen an AB- thats the last one i need and im saving my last ninja spot on it but i cant find it anywhere
It can be frustrating.