Thanks but I done the first method you said and it not worked because there are too many cases of possible directions when hitting a wall. When I have the feeling to have found them all, new cases wet and again and again...
The second method is too hard for me to code because I will have many rooms, someones will be huge so it may take too much place on the calculators
Thanks however but if you have some code, don't hesitate

Progress :
- few minor bugs fixed
- physics & display system updated, to allow next update
- room change working now !! (great thanks nemo but I used your method in a different way )
- missile tanks added !!

Here is my today's and yesterday's work

(screenies if I could have enough time )

It would be be better if my map data under 65535 I remember you talked about this method I another topic but can I to do an "if" test to put right saferam data for all rooms ? like :
if room=1
xoffset
yoffset
ennemies
items
end
if room=2
...

and then to put your code ?

I meant rooms where you can save your progress (attached my quickest screenie because I hadn't had enough time to do it )
But I ve a very big problem !!! I've a program named "METROMAP" holding all my map datas stored like:

if room=1
size
data
end
if room=2
size
data...

Then how can I access it during game to update map changing room number

okay

Edit : Save Units (not save system) added, but it remains impossible to change room because doors doesn't working yet. I' hard working on it of course

updates :
- ennemies following samus coded (way of moving of metroids)
- fixing ennemies walking (or flying) between 2 points
- issues with ennemies moving around walls :
*tile detection up/dwn/lft/rght : done
*x and y increasing or decreasing if the are different to destX and destY : done
* destX and destY calculation regarding differents cases of wall detection : bugging
Does anyone has an algorithm or have I to code all collision detection cases ?

edit : items coded

Sorry ScoutDavid but I've no idea of it. The problem with me is sometimes work go very fast and other times it goes very slow (and there is scholar work too ). However, it mainly remains to me to code :
¤ missiles & other weapons (time : quite fast for me)
¤ AI's & bosses movements and attacks (time : quite long for me)
¤ Items (time : quite fast)
¤ room transitions (time : quite fast)
¤ menus (time : fast)
¤ maps (time : long but if my engine is finished it will be easy to do )
Here is, so I think my beta will come when it will be a real story with objectives, missions, etc... and then I will release regarding eventual bugs people can find in the game

Dont worry about that I'm not coding menus and M.C.M will certainly be an app (to preserve ram for maths )
I'm coding ennemies yet but I crashed my calculator many times searching to make them walking around room's walls
Does anybody have algorithms ? maybe Ashbad ?