What You Need:
Jailbroken IDevice*
iFile
Diskaid/Ifunbox/SSH
7-Zip (if you want it the easier way)
Back to the Future. IPA (from your own sources)

1. Extract the directory Payload/BackToTheFuture101.app from the .ipa, Using 7-zip to your desktop
2. Copy BackToTheFuture101.app (folder) to Applications Folder on your iDevice, There is a shortcut in the root of the iDevice, using Diskaid/Ifunbox/SSH.
3. On your iDevice, go on iFile, go to the Applications folder and find BackToTheFuture101.app (folder) and click the blue arrow.
4. Under Access Permissions Change the Settings according to this:

User - Read,Write,Execute
Group - Write,Execute
World - Write,Execute
​

5. Go into BackToTheFuture101.app (folder) and change the following files BackToTheFuture101 and Pkginfo Permissions according to the same thing above.
6. Re-spring
7. the app should be there and Run it! (the first time its glitch but the next time it works)

Congratulations !​

Screen Shots:

Spoiler

​

*- I Recommend you use an Iphone 4 or Ipod Touch 4 For quality reasons

This was tested with an iPod touch 4
Also the text looks very pixely and unreadable but everything else seems to work
P.S First Tutorial

 

[alidsl]

I'm confused, why do you need to do this? Is there not an ipa?

 

[Joe88]

its looks like absolute crap compared to the pc ver

 

[8BitWalugi]

its looks like absolute crap compared to the pc ver

It's the iPad version running on the iPhone 4. Of course it'd look like crap with all that screen compression.

 

[metamaster]

Does this work with any iPad game?

 

[alidsl]

If it did that would be awesome

 

[bladepwnedyou]

When are they releasing part 2? I thought it was suppose to be this month.

 

[geoflcl]

Neat! I imagine a lot of people will be glad to be able to play this on their iPhones and iPods (although screen size is a concern for me).

I've seen a number of methods for getting iPad apps to run on other iDevices, and though they work like a charm, they all seem to want to display the game at a 480x320 resolution, even on Retina devices like the iPhone 4 and iPod Touch 4. That's the reason it looks so horrid in the screenshots. If one were able to find a way to make the apps run in the iPhone 4's native 960x640 resolution, I imagine the game would look much nicer.

 

[Joe88]

When are they releasing part 2? I thought it was suppose to be this month.

it came out on the 15th

 

[Fluto]

Does this work with any iPad game?

You can try because some apps dont work when is on the iphones/ipod touches

 

[8BitWalugi]

How does it look if you use the 3 finger zoom function?

 

[8BitWalugi]

How does it look if you use the 3 finger zoom function?

 

[alidsl]

Im gonna try this with world of goo sometime, I'll let you guys know if it works

 

[alidsl]

I tries it with world pf goo an the icon wont show up

Ok i found a way to do it, copy all the files from wog.app and delete the ones inside of some shitty app. Them paste the world of goo files in. Then respring