I'm working on a simple space invaders clone to teach a workshop this october.
This is what I've got:
INVADERS GAME:
Update 1:
- Added lives can't lose em yet.
- Added ufo
Update 2:
- Added levels
- Added level transition
Update 3:
- Added game over
- Scaling difficulty with levels
Update 4:
- Added start screen
- Capped level difficulty
- Changed reset from O to X



Alright, outstanding, @dani-0TB !
Yes indeed. The invaders do not descend a vertical row unless they are touching the left or right edge. So if you shoot a whole column in that area the invaders will not descend until the NEXT column touches there.
Also the original Space Invaders moves one invader at a time. It's pretty neat to watch when you look for it.
https://youtu.be/MU4psw3ccUI?t=23
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Gold star work !




This is strange, getting ready for bed. If you look at the post above and its date I did not just write 2-minutes ago. @zep, this is something to investigate. I've seen this strange phenomenon before.



These are very passive invaders - they don't fire back! But keep going developing this. It's a good start.
Although, maybe you should look at the link @dw817 provided and go for the "classic" invader sprites...



Yes for now it's what I've got, next step will be adding the barriers and then shooting. Maybe with some 2 hit system, so the red saucer kills you with one shot and the invaders with two.
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