For me, the easiest part is getting the central logic working.
The hardest is getting the achievements logic working.
Impossible is the art, because I am in no way a designer.
What about you?
The hardest part for me is finding the time to actually develop it.
Art is a close second though; I can’t find a quality artist who doesn’t flake on me.
Art, art art.
However… Running your game with a memory watcher on and finding a memory leak is also pretty bad, especially if you have somewhere in the upper 1500’s of lines of code…in all of your 15 files 
- C
Easiest thing for me is developing the core mechanics.
Hardest (the most painful and boring :D) polishing little details, tweaking buttons, tutorials.
And finding a good artists to fit the game graphics I’m looking for.
-
Getting art and graphics to a state I’m satisfied with
-
Fine-tuning the details
-
beta-testing and fixing issues
-
Finding time to sleep
Developing core game mechanics is the most fun and the first thing I do – and it feels like it gets done very fast – then the pain of creating artwork and working out the UI, the look & feel, and then even more painful process of finding sound (even if it doesn’t take as long, it still is quite painful.)
Also, adding features like IAP, Facebook, push notifications, multiplayer, etc. take up more time than desirable. I mean, implementing them the first time can be super frustrating process especially when they require device build to test.
And then comes the never-ending tasks ensue, which is the most trying part for me:
-
Fine tuning the game mechanics, design, game flow, etc.
-
Updating/changing/modifying code as design changes
-
Testing, testing, testing, testing, testing as things change.
-
Generating release build, then go through full testing cycle again to make sure it is releasable
-
Making sure all release versions (free vs. paid, iOS vs. Google Play vs. Amazon, etc.) are tested and deployed.
Naomi
For me…
-
Coming up with something not done yet and worth doing…
-
Artwork as I am no artist nor do I have access to one…
-
Self … procrastination dwelling on #1 & #2…
The rest is easy thanks to the community here and the Corona SDK.! 
The hardest part for me is finding the time to actually develop it.
Art is a close second though; I can’t find a quality artist who doesn’t flake on me.
Art, art art.
However… Running your game with a memory watcher on and finding a memory leak is also pretty bad, especially if you have somewhere in the upper 1500’s of lines of code…in all of your 15 files
- C
Easiest thing for me is developing the core mechanics.
Hardest (the most painful and boring :D) polishing little details, tweaking buttons, tutorials.
And finding a good artists to fit the game graphics I’m looking for.
-
Getting art and graphics to a state I’m satisfied with
-
Fine-tuning the details
-
beta-testing and fixing issues
-
Finding time to sleep
Developing core game mechanics is the most fun and the first thing I do – and it feels like it gets done very fast – then the pain of creating artwork and working out the UI, the look & feel, and then even more painful process of finding sound (even if it doesn’t take as long, it still is quite painful.)
Also, adding features like IAP, Facebook, push notifications, multiplayer, etc. take up more time than desirable. I mean, implementing them the first time can be super frustrating process especially when they require device build to test.
And then comes the never-ending tasks ensue, which is the most trying part for me:
-
Fine tuning the game mechanics, design, game flow, etc.
-
Updating/changing/modifying code as design changes
-
Testing, testing, testing, testing, testing as things change.
-
Generating release build, then go through full testing cycle again to make sure it is releasable
-
Making sure all release versions (free vs. paid, iOS vs. Google Play vs. Amazon, etc.) are tested and deployed.
Naomi
For me…
-
Coming up with something not done yet and worth doing…
-
Artwork as I am no artist nor do I have access to one…
-
Self … procrastination dwelling on #1 & #2…
The rest is easy thanks to the community here and the Corona SDK.!