Archive for the 'Invader Zurp' Category

Zurp 1.0 Postmortem

December 15th, 2011
Spencer Nielsen Follow snielsen42 on Twitter

Last September I wrote a blog post introducing Invader Zurp which revealed a little of the back story on how I came upon this new game idea after it’s first 2 months in development. Fast forward to 3 months later and Invader Zurp had just hit the App Store! I thought it would be useful to sit down and review the last 5 months of development, kind of plan out where I want to go from here and go over the events and insights that I thought were most influential during development.

The Story So Far…

So to recap the original blog post a bit, it was the middle of the summer (2011) and I had been working my brains out on Cannonade for the previous 6 months. I was a little discouraged at that point because progress wasn’t coming quite as quickly as I had hoped. Reception from my testers (just friends and family at that point) hadn’t been as positive as I had wanted either. I still had a very clear vision of what I wanted Cannonade to be and still believed that there is a ton of untapped potential for multiplayer-only games on iOS. But there was only so much I that could do as a one-man team and testing a multiplayer game can be quite time consuming. I took the family on vacation in early July and was able to step away from things for a while. It was then that I got an idea for a single player experience that distilled the core gameplay mechanic of Cannonade down to it’s essence. Thus Invader Zurp was born. Within two weeks I had modularized the Cannonade game engine, re-written the graphics sub-system in OpenGL ES 2.0 and had a working prototype. And it was fun! I found myself on very long “testing” sessions playing even after I had verified my fixes. I seeded the first alpha version in early September and wrote the introductory blog post. Then began the journey of finishing the game and kicking the darn thing out the door. (more…)

Invader Zurp is on the App Store!

December 15th, 2011
Spencer Nielsen Follow snielsen42 on Twitter

Aright it’s here! Invader Zurp, the project I have worked so hard on for the last 5 months is now for sale on the App Store! I want to thank all my wonderful testers for all their time they put into playing it and even more for the thoughtful and productive feedback that they so lavishly furnished on me. I couldn’t have done it without you!

Check out the gameplay trailer here:

Now Go Get It!

Application-Specific Bullet Physics Optimization

December 13th, 2011
Spencer Nielsen Follow snielsen42 on Twitter

In developing Cannonade and Invader Zurp I have invested a fair amount of time becoming familiar with the Bullet Physics Library and trying to milk every bit of performance out of it as I can. Realistic physics simulation plays a crucial part in both games and is also the performance bottleneck in the majority of gameplay scenarios with both. When trying to optimize for performance I generally see myself using two kinds of approaches. One is a higher level algorithmic approach that tries to see ways to create less work or avoid work in order to keep things going fast. Once I have nailed down as best I can, the minimum set of work that I really cannot avoid doing, then comes the work of getting down and dirty and speeding up the routines that actually do that work. When I initially approached the problem of speeding up Bullet, I first simply treated it as a black box (work that I wouldn’t be able to avoid) and explored what kinds of compiler configurations I could leverage to create the fastest possible execution of the physics simulation work. Later, after I had nailed down the gameplay mechanic for Invader Zurp I was able to start specifically attacking the set of physics simulation work needed for the game and whittled it down to a much smaller amount using some simplifications, accuracy compromises and psychology.

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Invader Zurp Progress

October 27th, 2011
Spencer Nielsen Follow snielsen42 on Twitter

Above is some footage from the current Invader Zurp alpha (apologies for the bad exposure). As you can see, things have come quite a ways since I released the first video! There are a lot more visual effects, 5 music tracks from Monte ‘Trance’ Emerson, a new gameplay mechanic, an in-game currency system and tons of other little advancements. I must say that I feel like things are progressing quite nicely! I still have a ways to go though and so I am going to continue cranking away with my head down until it is finished.

What are your thoughts on how development is going? Let me know in the comments. Also, a huge thank you to all of my testers who have given me invaluable feedback on all the builds thus far.

Invader Zurp

September 12th, 2011
Spencer Nielsen Follow snielsen42 on Twitter

So for those of you on my Cannonade TestFlight profile, you might have noticed that I havn’t seeded a build for about two months. I have a good explanation for this.

Lets rewind back to right after my last Cannonade seed build. I was on vacation at the time and had the opportunity to stand back from Cannonade and evaluate things from a different perspective. Sometimes I don’t think I seek out those opportunities to just sit and think as much as I should (just thinking sometimes makes me feel a bit lazy for not doing). At one family gathering I observed my older son playing Fruit Ninja on his aunt’s iPhone. I was aware of Fruit Ninja and knew that it was a definite App Store success. As I watched him play I thought to myself “That just one play mechanic. One. Repeated, millions of times over and over and over.” This is the typical MO of most games that are successful on the App Store. Simple, easy to pick up and well implemented with good production values. With Cannonade I am trying to break new ground on the App Store. I still believe that there could be a place for deep multi-player experiences on the App Store and I think that Cannonade is on the right track. But watching Fruit Ninja got me thinking. Did I have a single, fun gameplay mechanic that I could repeat millions of times? The core fun mechanic of Cannonade is “Knock Your Friend’s Castles Down.” Maybe I could modify that to just “Knock Castles Down.” Even knocking down dumb castles was fun in and of itself. Maybe I could repeat that experience millions of times and put out a more limitedly scoped single player experience? I decided that it would be a really fun exercise and that I would put Cannonade on hold for a few months while I brought this new single player game to market. I call it “Invader Zurp“.

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