Share this project


Share this project

Put on a lizard and go for an adventure! A new game for Nintendo Entertainment System, PC, and Mac.
Put on a lizard and go for an adventure! A new game for Nintendo Entertainment System, PC, and Mac.
325 backers pledged CA$ 18,440 to help bring this project to life.

My lizard is the Lizard of Tile Maps

Posted by Brad Smith (Creator)

In previous updates, I talked about how I doubled the ROM size and I've tried to describe the consequences of this. Today I'd like to show you what it means with a picture.

Here is a comparison of the Marsh and Water zones, as they appeared in the demo, and now redone with the new target data size.

I'm very happy with what the bigger ROM size is letting me do. This looks and feels a lot more like what I had in mind when I was initially planning the game. There's more space to explore, and a lot of places that I felt were crowded can now be relaxed.

If you tried the demo you should be familiar with how the old version plays, and I hope that helps you imagine how much more spacious the new version is. By the way, if you thought you'd seen everything in the demo, remember: there's always something else to find. ;)

NES Tiling

Backgrounds on the NES are made of a grid of 8x8 pixel tiles, but using a 16x16 pixel grid of colours. Several systems of the time separated colour and detail, but the size disparity between these two things on the NES is a rather unusual feature of the machine.

The colour grid, known as the "attribute" table, allows you to select 1 of 4 palettes to use in each 16x16 region of the screen. Each of these regions requires 2 bits of data, so it packs groups of 4 of them into a single 8-bit byte representing a 32x32 pixel region of the screen. Various NES developers took a different approach to organizing their map data for the hardware.

Legacy of the Wizard
Legacy of the Wizard

Legacy of the Wizard builds its levels entirely with 16x16 pixel blocks. Basically, the 8x8 level of detail is foregone in solidarity with the colour selection. Most NES games are organized in a similar way.


Battletoads uses larger 32x32 pixel blocks. In this way it seems to be organized around whole attribute bytes, rather than the highest level of colour detail. The larger block size also helps create larger maps with less data. Because Battletoads scrolls in all directions and has large character sprites, this seems a sensible choice.

Lizard uses an 8x8 pixel level of detail, and I have to carefully tiptoe around the 16x16 colour grid while I'm laying out the tiles. A consequence of this is that my maps potentially take 4 times as much information as ones using 16x16 blocks. This is why doubling the ROM size has made such a difference; I wanted small characters and a high level of visual detail, and this has a significant data cost!

Sometimes I am at the mercy of the hardware, however, especially in areas which require an extra colour in the palette for the sky. Some places in Lizard have a blockier 16x16 look, where I am unable to work around the limitations.

Nekketsu! Street Basket: Ganbare Dunk Heroes
Nekketsu! Street Basket: Ganbare Dunk Heroes

Well made NES backgrounds often involve art that is drawn in ways that hide the 16x16 boundaries. I think this one from Nekketsu! Street Basket: Ganbare Dunk Heroes is particularly well crafted, though it does have the luxury of being merely a backdrop, not bound by functional constraints like maps in a platform game would be.

Pillars of Eternity

Before I go, I'd like to congratulate Obsidian Entertainment on the recent release of Project Eternity.

Aside from being a fellow Kickstarter project, Obsidian Entertainment was a place I called home for a few years of my life. My professional career started there, and I remember my time there fondly. It gives me a lot of pleasure to see my friends and former colleagues succeed like this.

I haven't played too far into the game yet, but I've been enjoying it a lot. It's a role-playing game, and it really makes good on the role-playing part. I was talking with a friend who had also been playing, and we noticed that one of the characters in the game had reacted very differently to each of us. I realized that I had described myself very differently to that person in the game than my friend had, and it had made a very real difference in the gameplay. This is something Pillars of Eternity has done really well that I think is very rare. The detail of dialogue options, and their consequences, encourages you to make up stories about yourself as you play. It's quite engaging!

John Allen, Fernando Sarmiento, and 4 more people like this update.


Only backers can post comments. Log In
    1. Matt Lohkamp on

      I always appreciate the hell out of your updates. Final stretch!

    2. Fei on

      Waaaaah I like your updates.
      And very instructive :)
      Thanks !

    3. John Allen on

      Thanks for the update and education! Looking forward to playing Lizard #whenitsdone