UPDATE !

If you have friends (or if you have several calcs ), you're going to have even more fun !
Mutiplayer support by link port is now supported
Now you're going to be two Foxes trying to cancel Illusions near edges

Runer and I finally figured out that the problem was that the port commands "only" work at 6MHz -.-
He also helped making me understand that there's almost no point putting something else than 65535 as a Delay for Send (I though Send kept trying without caring if someone was listening, not that it waited until someone comes or until it timeouts).

Executables have different names so that you can have both "sociable" and "forever alone" () versions on your calc.

This updates also improves camera, which tries to keep the map in the field of vue even if both players go away in the same direction, but I guess it seems unimportant now

If you ever notice desync (or any other problem in fact), please report.

Links:
Rectangles
Full Map

On the old release yes, use the numpad, log and x² to control the other Fox

Well then, time for me to buy a new calc to calc cable!

EDIT: It seems that this one doesn't work in WabbitEmu, no matter what I try. The previous version let me play in linked play pretty fine, but with this one, either it doesn't get past the You are P1 and P2 screens or it fails to detect the other calc.

Wait, are you trying to play in linked play on Wabbitemu ? I didn't know that was possible.
Does it work on real calcs ? Because I didn't try on emulator, just on my 84+SE calcs (didn't try on 6MHz calcs btw).

Yeah WabbitEmu has linked play (which worked with the previous version of your game).

Ok, well that's completely weird. The only things that were added are a Normal before the linking part and a Full after it
And too bad you can't test on real calcs because I can tell you it works on mine
At worst, you could try this with Juju when you next meet

Also, yeah, the game is slower on 6MHz, that's why there's the version with only rectangles to speed things up a bit. Basically, don't play the "Full map" version on a 83+, it will be too slow, and don't play the "Rectangles" version on a 84+, it will be too fast

edit Yeah, I have strange behaviours with Wabbitemu too. For example, the first calc that launches Smash says "You are Px" without waiting for anything, then the second calc, when it launches Smash, waits for the other calc that is already in the main loop so this one has to quit and come back. Then they agree for real for the "You are Px" part but stop here.
I guess there are problems with link cable emulation.

edit It works fine with PindurTI with a 83+ rom (so try with the Rectangles version)

Well I tried it and it does things through the cable (if it did nothing, it would not get past "Waiting for other calc"), but it doesn't seem to do the right things.
But I tried PindurTI. Except the fact it only emulates the 83+ and no 15MHz models, it works great, especially with linking.

No, no, two windows. I meant the virtual cable, sorry.

Both maps have the same dimensions. The "Full Map" version just uses scaled sprites for the edges of the platforms while the "Rectangles" version only uses rectangles.