Gravitee Wars  A Post Mortem   Speaker: Stuart Allen   FunkyPear.com
Part 1: Background
The Gravitee Series●    Gravitee 1 and Gravitee 2     ●    Golf in space     ●    Newtonian physics to simulate gravity   ...
Gravitee 1●    Released September 2007●    Approximately 5m - 6m plays●    Current Ratings     ●    Newgrounds – 4.22 (Fro...
Gravitee 2●    Released August 2009●    Approximately 4.5m - 5.5m plays●    Additional game modes & improved graphics●    ...
Gravitee Wars●    Original concept for Gravitee 1●    Change of gameplay from golf to artillery     ●    Concerned about a...
Part 2: Development
Initial Thoughts●    Single player planned since day one●    Multiplayer possibilities for future games●    Unit personali...
Destructible Planets (1 of 3)●    Each planet originally a bitmap, with explosions     being removed from the bitmap     ●...
Destructible Planets (2 of 3)●    Planet shape stored as a series of points     ●    Planets made up of about 40 points●  ...
Destructible Planets (3 of 3)●    When a planet is hit, another series of points     representing explosions created●    F...
Cheap Gameplay●    Wanted to use cheap gameplay to keep     players playing     ●    Better medals awarded for better scor...
Unit Movement●    Units can walk around planet CW/CCW●    Started with Right = CW, Left = CCW     ●    Makes less sense wh...
Artificial Intelligence (1 of 2)●    No experience with AI!●    Various stages     ●    Are there any pickups I can get?  ...
Artificial Intelligence (2 of 2)●    AI throws out 720 different shots (72 different angles,     10 different powers)●    ...
Part 3: Response
Response Overview●    Very well received!●    Hit the 1m gameplay mark after 6 days●    Total plays to date approx 12m – 1...
User Complaints (1 of 3)●    AI Flaws     ●    Enemies take too long thinking – fixed     ●    Enemies walk over mines    ...
User Complaints (2 of 3)●    Balancing issues     ●    Why dont the AI teams shoot at each other?     ●    Money cheat – e...
User Complaints (3 of 3)●    Miscellaneous     ●    Intuitive movement – hard to control     ●    No multiplayer yet!
Revenue % Break Down
Thanks for listening! :)
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
Gravitee Wars Post Mortem by Stuart Allen of FunkyPear
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Gravitee Wars Post Mortem by Stuart Allen of FunkyPear

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Presentation by Stuart Allen of FunkyPear at Mochi London 2011, a post mortem of the highly successful game Gravitee Wars.

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Gravitee Wars Post Mortem by Stuart Allen of FunkyPear

  1. 1. Gravitee Wars A Post Mortem Speaker: Stuart Allen FunkyPear.com
  2. 2. Part 1: Background
  3. 3. The Gravitee Series●  Gravitee 1 and Gravitee 2 ●  Golf in space ●  Newtonian physics to simulate gravity ●  Sponsored by Kongregate
  4. 4. Gravitee 1●  Released September 2007●  Approximately 5m - 6m plays●  Current Ratings ●  Newgrounds – 4.22 (Front Page) ●  Kongregate – 4.00
  5. 5. Gravitee 2●  Released August 2009●  Approximately 4.5m - 5.5m plays●  Additional game modes & improved graphics●  Current Ratings ●  Newgrounds – 4.00 ●  Kongregate – 4.05 ●  Lower than Gravitee 1 – Original gameplay diluted?
  6. 6. Gravitee Wars●  Original concept for Gravitee 1●  Change of gameplay from golf to artillery ●  Concerned about alienating original players ●  Weapons and violence seem to do well!
  7. 7. Part 2: Development
  8. 8. Initial Thoughts●  Single player planned since day one●  Multiplayer possibilities for future games●  Unit personality●  Destructible planets●  AI quality important●  Cheap gameplay ●  Medals, achievements & rewards
  9. 9. Destructible Planets (1 of 3)●  Each planet originally a bitmap, with explosions being removed from the bitmap ●  Simple implementation ●  How to get units to walk around planets correctly? ●  How to calculate the new planets mass after an explosion?
  10. 10. Destructible Planets (2 of 3)●  Planet shape stored as a series of points ●  Planets made up of about 40 points●  Units walk around by following the line represented by two consecutive points●  Shape drawn to a Movieclip then used as a mask over the planet graphic●  Vector representation means mass easily calculated
  11. 11. Destructible Planets (3 of 3)●  When a planet is hit, another series of points representing explosions created●  Function takes the explosion and planet shapes and cuts the explosion shape out of the planet ●  Calculates intersections between the shapes ●  Walks around each shape until it intersects the other shape, then switch shape and continue until back to origin
  12. 12. Cheap Gameplay●  Wanted to use cheap gameplay to keep players playing ●  Better medals awarded for better scores ●  Achievements ●  Rewards –  New weapons –  Unit victory and idle animations –  Features (old school GFX, infinite ammo)
  13. 13. Unit Movement●  Units can walk around planet CW/CCW●  Started with Right = CW, Left = CCW ●  Makes less sense when at the bottom of a planet●  Decided to try to guess which way the player wanted to move ●  At top of planet R = CW, L = CCW ●  At bottom of planet L = CW, R = CCW
  14. 14. Artificial Intelligence (1 of 2)●  No experience with AI!●  Various stages ●  Are there any pickups I can get? ●  Am I directly in the line of sight of enemies? If so, is there somewhere I can retreat to after shooting that isnt? ●  Gravity set up too complicated to work out a power & angle to guarantee a hit.
  15. 15. Artificial Intelligence (2 of 2)●  AI throws out 720 different shots (72 different angles, 10 different powers)●  AI decides on which of those shots to take, based on who can be hit, how much health they have and what weapons are available●  Each enemy team has an accuracy score. Shots are knocked off by a random amount, based on this score.●  Originally if the AI couldnt hit an enemy it would move or teleport to another planet and try again
  16. 16. Part 3: Response
  17. 17. Response Overview●  Very well received!●  Hit the 1m gameplay mark after 6 days●  Total plays to date approx 12m – 15m●  Current Ratings ●  Newgrounds – 4.42 (Top 50 for a while) ●  Kongregate – 4.40 (Best of Nov 2010)
  18. 18. User Complaints (1 of 3)●  AI Flaws ●  Enemies take too long thinking – fixed ●  Enemies walk over mines ●  Enemies are too accurate with their shots ●  Enemies dont use all of the weapons
  19. 19. User Complaints (2 of 3)●  Balancing issues ●  Why dont the AI teams shoot at each other? ●  Money cheat – end score based on health remaining and damage done ●  After earning enough money, its easy to just meteor strike and nuke the enemy to death
  20. 20. User Complaints (3 of 3)●  Miscellaneous ●  Intuitive movement – hard to control ●  No multiplayer yet!
  21. 21. Revenue % Break Down
  22. 22. Thanks for listening! :)
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