modify 3d game made in Unity3d

my budget for this work is limited and final so only serious people should post their bid otherwise i will report you to freelancer for offensive or fake bid postings. read the description carefully and then post your bid, ok. there is a soccer penalty kick game which needs your attention. you should ask me first that what version of Unity you should have use for it. there are 7 gameplays which you have to modify/create as required. they have some flaws in them and i need you to remove those flaws as well as make it functional as wanted. the integration of ads are part of this project. you also have to make few changing in the UI related some functions as required. my budget for this work is limited and final so only serious people should post their bid otherwise i will report you to freelancer for offensive or fake bid postings.