Sonic 2 Bonus Stage Tweetcart

Hello everyone,

I recently joined a game jam, TweetTweetJam, that has the goal of creating a game with under 560 characters of code (so it fits in 2 tweets). You also can't use anything other than code for the game (no sprites, music, sfx).

My entry is inspired by Sonic 2 bonus stages:



The objective is simply to get as far as you can to increase your score and speed.

Itch io here.
If you're interested to see the code, it is available here.

 

Oh yea, knowing how to present your game is just as important as knowing how to make a good game... I learned that the hard way, haha

 

@Aerosol As muteKi pointed out the game is similar to Andy Asteroids in EWJ, but in that game the tunnel is always in the same position, so I imagine it's just a static image with palette swaps. In my game the effect is achieved by drawing a lot of circles. I don't think the Mega Drive was able to draw circles like this, considering I never saw it in a game.


^This is how each frame is drawn.

@muteKi Considering you can jump in this I would say it's more similar to Sonic 2 bonus stage, which was the goal (never played the 1st EWJ though). Visually it's more similar to EWJ, sure. There's not much I can change, considering a tweettweetcart can use 560 characters, and I already used 558 :P

 

Here is the code before compression. I changed the tube behavior to bend with Up/Down and Rotate with Left/Right. I disabled the collision of the balls. If you want to prevent the black/blue balls form being drawn just erase under the commentated parts:

ang=0
hght=0
ys=0
dist=0
spd=.06
q=.01
d=0
tang=0
function g(z,ang,c,hght,siz)
circfill(
sin(ang)*(z-hght)*.9+x,
cos(ang)*(z-hght)*.9+y,
siz or z/10+1,c)
end
::_::
cls()
ang+=((band(btn(),3)+1)%3-1)*q
if hght==0 then
ys=0
if (btn(4))ys=5
end
hght=band(hght+ys,63)
ys-=.5
dist+=spd
spd+=q^2
cicl=flr(dist/30)
srand(cicl)
tang+=(btn(0) and .01 or 0)
tang-=(btn(1) and .01 or 0)
d-=(btn(2) and 1 or 0)--(sin(dist/60)*(rnd(4)+4))^3
d+=(btn(3) and 1 or 0)
for z=1,97,.1 do
c1=clr
offs=flr(d/z)

if offs!=flr(d/(z+.1)) or flr(z)!=flr(z+.1)then
k=40/z+dist
srand(clr)
clr=flr(k)
clr=clr+shr(clr,8)
for i=0,1 do
x=64+(i+offs)*sin(tang)
y=64+(i+offs)*cos(tang)
circ(x,y,z,clr%8+8)
circ(x,y+1,z,clr%8+8)
end

--remove this to hide the black balls
if c1!=clr then
tt=rnd()
g(z,tt,0,4)
--remove this to disable ball collision
--if(hght<15 and z>47 and z<53 and(ang-tt+.95)%1>.9)run()
end
end
end
--remove this to hide the blue ball
g(64,ang,2,0,3)
g(64,ang,1,hght)
flip()goto _​