Big thanks to MGOS! You helped me a lot

Something you absolutely need to know : if you want to use trig, just build some LUTs (look-up tables, tables to hold constant values instead of recalculating them) and leave sin() and cos() alone. Do that at the really beginning of your code :

:_E90D3→°SinLUT+2→°CosLUT
:L₁→SinLUT+256→CosLUT       // L₁ or whatever free RAM area of at least 512 bytes
:~1       // the negate sign, not the minus
:For(256)    // 256 possible angles, from 0 to 255
:sin(+1→r₁)→{r₁+SinLUT}
:cos(r₁)→{r₁+CosLUT}
:r₁
:End

sry, but I don't understand this It seems to be highly optimized.. Can you give me a less optimized version, so that I can understand it? I mean, I want to understand "my" code

Thanks though, a LUT is a good idea

I made a raycaster, the way I got rid of the fishbowl affect was to make the "side-rays" "jump" more. Therefore their reading will be less. If you understand what I mean. It's like making the walls on the side of your screen show up bigger.

Address->°Name will create a custom variable called “Name" at the given address. You can call the varables how you want, in this case CosLUT or SinLUT. The address should be some empty ram area at least 2 bytes large, since the varables in axe are all 16 bit - at that address the value of the variable is stored. Once you created a new variable, you can use them just like any other variable A-Z or theta.
In the second step you make those variables point to some free ram (L1 and L1+256), so now they hold the the address of the both areas which are use as LUTs.

With this way of thinking, you can still directly use L₁.