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_init() -- called once on program startup
_update() -- called once per update at 30fps
_update60() -- called once per update at 60fps
_draw() -- called once per visible frame

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assert(condition) -- verify that condition is true
cd .. -- change to parent directory
cd [dirname] -- change directory
dir() -- list items
exit() -- close pico-8 app
export(filename.html, [cart1.p8, cart2.p8 ... cart15]) -- export game in html; up to 15 extra carts (.p8 format)
export(filename.png) -- export spritesheet
export(filename.wav) -- export the current sfx / music
export(filename%d.wav) -- export all sfx as numbered files
extcmd(cmd) -- control screenshots; "label" = cart label; "screen" = screenshot; "rec" = start gif; "video" = save gif
folder() -- open carts folder in operating system
help() -- show summary of system commands
import(filename.png) -- import spritesheet. expects 128x128 png and colour-fits to the pico-8 palette
info() -- print cart info
install_demos() -- install demo p8 carts alongside pico-8 app
install_games() -- install selection of bbs carts
keyconfig() -- keyboard configuration for player buttons
load("@clip") -- paste cart from clipboard, bbs support
load(filename) -- load cart; works with multi-cart export
ls() -- list items
menuitem(index, [label, callback]) -- add an extra item to the pause menu; index in [1..5]; no label or callback removes the item
mkdir(dirname) -- create directory
printh(str, [filename, overwrite]) -- print str to terminal; append or overwrite to filename
reboot() -- reboot pico8
resume() -- resume cart execution
run() -- boot cart
save("@clip") -- copy cart to clipboard, bbs support
save(filename) -- save cart
shutdown() -- close pico-8 app
splore() -- explore cartridges
stat(x) -- read some execution values, read below
time() -- returns seconds since last reboot
type(v) -- returns type of v: number, string or table

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stat(0) -- memory usage in [0..1024]
stat(1) -- cpu usage; 1.0 == 100% cpu at 30fps
stat(4) -- clipboard; after user pressed ctrl-v
stat([16..19]) -- index of playing sfx on channels [0..3]
stat([20..23]) -- note number (0..31) on channels [0..3]
stat(30) -- keyboard key hit; see "peek / poke" tab
stat(31) -- keyboard character; see "peek / poke" tab
stat(32) -- mouse x coord; see "peek / poke" tab
stat(33) -- mouse y coord; see "peek / poke" tab
stat(34) -- mouse button bitmask; see "peek / poke" tab

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pico8_gpio[] // read and write gpio pins
pico8_buttons[] // bitfields for player input

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-- After running the game with ctrl + r, press escape to pause execution
. -- Entering a '.' into the console will advance the game to the next frame
enter -- Continue entering the '.' character or simply press enter
print(player.x) -- Show the current, live x value of the player. Game does not cease execution, & updates each frame!
?player.x -- '?' functions just like 'print' and can be used in place as shorthand
resume() -- The 'resume' function will return the game to a normal running state.

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_get_frames_skipped() -- used automatically by _mainloop()
_get_menu_item_selected(n) -- returns true or false if the n-th menu item is selected; n in [1..5]; used automatically by _mainloop()
_mainloop() -- main pico-8's "while true"
_pausemenu[n].callback() -- execute the n-th menu item's callback; n in [1..5]; used automatically by _mainloop()
_set_mainloop_exists(n) -- ?
_update_buttons() -- used automatically by _mainloop()
holdframe() -- used automatically by _mainloop()