pico8-0hh1/states/game.lua

function state_game()

	local board
	local selected_id = 1

	local function drawSelectedTile()
		local x, y = board:draw_coords(selected_id)
		local w = board:get_tile_width()
		fillp(▒)
		rect2(x-1, y-1, w+2, w+2, 6)
	 	fillp(█)
	end

	local function _enter(_board)
		board = _board
		-- lock the initial tiles
		board:lock_tiles()
	end

	local function _draw()
		cls()
		board:draw()
		drawSelectedTile()
	end

	local function _update()
		local size = board:get_size()
		local x, y = board:idx_xy(selected_id)
		if btnp(UP) then
			y -= 1
		elseif btnp(DOWN) then
			y += 1
		elseif btnp(LEFT) then
			x -= 1
		elseif btnp(RIGHT) then
			x += 1
		end
		if (x<1) x=size
		if (x>size) x=1
		if (y<1) y=size
		if (y>size) y=1
		selected_id = board:xy_idx(x, y)
	end

	return {
		_enter = _enter,
		_update = _update,
		_draw = _draw,
	}
end