# Can I change the tile size of a 2D isometric game in the middle of development?

First things first:

• This is just a side project.
• It's going to be my first "real" game.
• In real life I'm a full time web developer (ASP.Net) with several years of experience.
• I also have some basic knowledge of working in Unity 3D from several courses and small demos I've built.
• My pixel art skills still suck, but I'm working on it.

So, I'm working on a game design for quite some time now (years) and just completed the latest draft of the design document. It's going to be a 2D isometric tile-based game. I adore the pixel art of Undungeon in terms of character proportions, and want to aim for a similar style.

Here's my problem: I'd love to just get started with implementing my game, but I have no assets yet.

• Is it a reasonable approach to just start coding using placeholder assets, even if the whole grid size / character proportions are uncertain and probably going to change at some point? (Let's say my main characters sprite is 16x16 but I change it to 32x16 later on.)
• Should I just abstract everything away that deals with pixel sizes?
• Or bite the bullet and settle with a grid size from the very beginning?

I hope this isn't too broad of a question. Thanks for your help!

1. Very early in your project, define two constants TILE_WIDTH and TILE_HEIGHT.
2. Use these constants whenever you refer to the measurements of your tile. This also includes indirect values which are derived from them. If you ever need, for example, half the width of a tile, write TILE_WIDTH / 2. By the way, most compilers will notice that you are dividing a constant by a literal and calculate it at compile-time, so that's unlikely to affect performance.