diff --git a/.gitignore b/.gitignore
index 49c215b..5c8a6ca 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 !src/
 
 !.editorconfig
+!openttd.cfg
 !.gitattributes
 !.gitignore
 !v.mod
diff --git a/openttd.cfg b/openttd.cfg
new file mode 100644
index 0000000..2d18ce2
--- /dev/null
+++ b/openttd.cfg
@@ -0,0 +1,487 @@
+
+[version]
+version_string = 13.0
+version_number = 1D086D64
+ini_version = 2
+
+[network]
+commands_per_frame = 2
+max_commands_in_queue = 16
+bytes_per_frame = 8
+bytes_per_frame_burst = 256
+;max_init_time = 100
+;max_join_time = 500
+;max_download_time = 1000
+;max_password_time = 2000
+;max_lag_time = 500
+pause_on_join = true
+server_port = 3979
+server_admin_port = 3977
+server_admin_chat = true
+server_game_type = local
+autoclean_companies = false
+autoclean_unprotected = 12
+autoclean_protected = 36
+autoclean_novehicles = 0
+max_companies = 15
+max_clients = 25
+restart_game_year = 0
+min_active_clients = 0
+reload_cfg = false
+no_http_content_downloads = false
+use_relay_service = ask
+
+[misc]
+display_opt = SHOW_TOWN_NAMES|SHOW_STATION_NAMES|SHOW_SIGNS|FULL_ANIMATION|FULL_DETAIL|WAYPOINTS|SHOW_COMPETITOR_SIGNS
+fullscreen = false
+video_hw_accel = true
+video_vsync = true
+support8bpp = no
+graphicsset =
+soundsset = "OpenSFX"
+musicset = "OpenMSX"
+videodriver =
+musicdriver =
+sounddriver =
+blitter =
+language = english_US.lng
+resolution = 1920,1005
+screenshot_format =
+savegame_format =
+rightclick_emulate = false
+small_font = Arial
+medium_font = Arial
+large_font = Arial
+mono_font =
+small_size = 7
+medium_size = 8
+large_size = 16
+mono_size = 0
+small_aa = false
+medium_aa = false
+large_aa = false
+mono_aa = false
+sprite_cache_size_px = 128
+player_face = 0
+transparency_options = 511
+transparency_locks = 0
+invisibility_options = 6
+keyboard =
+keyboard_caps =
+last_newgrf_count = 16
+gui_scale = 175
+
+[difficulty]
+max_no_competitors = 0
+number_towns = 2
+industry_density = 4
+max_loan = 250000
+initial_interest = 2
+vehicle_costs = 1
+competitor_speed = 2
+vehicle_breakdowns = 1
+subsidy_multiplier = 2
+subsidy_duration = 1
+construction_cost = 0
+terrain_type = 4
+quantity_sea_lakes = 3
+economy = false
+line_reverse_mode = false
+disasters = false
+town_council_tolerance = 0
+
+[economy]
+town_layout = 3
+allow_town_roads = true
+found_town = 1
+allow_town_level_crossings = true
+town_cargogen_mode = 1
+station_noise_level = false
+inflation = false
+multiple_industry_per_town = true
+bribe = true
+exclusive_rights = true
+fund_buildings = true
+fund_roads = true
+give_money = true
+type = 1
+allow_shares = false
+min_years_for_shares = 6
+feeder_payment_share = 75
+town_growth_rate = 2
+larger_towns = 4
+initial_city_size = 4
+mod_road_rebuild = true
+dist_local_authority = 20
+town_noise_population[0] = 800
+town_noise_population[1] = 2000
+town_noise_population[2] = 4000
+town_noise_population[3] = 400
+infrastructure_maintenance = false
+
+[order]
+no_servicing_if_no_breakdowns = true
+improved_load = true
+selectgoods = true
+serviceathelipad = true
+gradual_loading = true
+
+[station]
+never_expire_airports = true
+station_spread = 12
+modified_catchment = true
+serve_neutral_industries = true
+adjacent_stations = true
+distant_join_stations = true
+
+[vehicle]
+road_side = right
+train_acceleration_model = 1
+roadveh_acceleration_model = 1
+train_slope_steepness = 3
+roadveh_slope_steepness = 7
+max_train_length = 64
+smoke_amount = 1
+never_expire_vehicles = false
+max_trains = 500
+max_roadveh = 500
+max_aircraft = 200
+max_ships = 300
+wagon_speed_limits = true
+disable_elrails = false
+freight_trains = 1
+plane_speed = 4
+dynamic_engines = true
+plane_crashes = 2
+extend_vehicle_life = 0
+servint_ispercent = false
+servint_trains = 150
+servint_roadveh = 150
+servint_ships = 360
+servint_aircraft = 100
+
+[gui]
+autosave = yearly
+threaded_saves = true
+date_format_in_default_names = long
+show_finances = true
+auto_scrolling = 0
+scroll_mode = 0
+smooth_scroll = true
+right_mouse_wnd_close = false
+measure_tooltip = true
+errmsg_duration = 4
+hover_delay_ms = 200
+osk_activation = disabled
+toolbar_pos = 1
+statusbar_pos = 1
+window_snap_radius = 10
+window_soft_limit = 20
+zoom_min = 0
+zoom_max = 5
+sprite_zoom_min = 0
+population_in_label = true
+link_terraform_toolbar = true
+smallmap_land_colour = 0
+linkgraph_colours = 0
+liveries = 2
+starting_colour = 16
+auto_remove_signals = false
+prefer_teamchat = false
+scrollwheel_scrolling = 0
+scrollwheel_multiplier = 5
+pause_on_newgame = true
+advanced_vehicle_list = 1
+timetable_in_ticks = false
+timetable_arrival_departure = true
+quick_goto = true
+loading_indicators = 2
+default_rail_type = 0
+signal_gui_mode = 0
+default_signal_type = 5
+coloured_news_year = 2000
+cycle_signal_types = 0
+drag_signals_density = 4
+drag_signals_fixed_distance = false
+semaphore_build_before = 0
+vehicle_income_warn = true
+order_review_system = 2
+lost_vehicle_warn = true
+new_nonstop = true
+stop_location = 2
+keep_all_autosave = false
+autosave_on_exit = false
+autosave_on_network_disconnect = true
+max_num_autosaves = 16
+auto_euro = true
+news_message_timeout = 2
+show_track_reservation = true
+station_numtracks = 1
+station_platlength = 5
+station_dragdrop = true
+station_show_coverage = true
+persistent_buildingtools = true
+station_gui_group_order = 0
+station_gui_sort_by = 0
+station_gui_sort_order = 0
+missing_strings_threshold = 25
+graph_line_thickness = 3
+show_newgrf_name = false
+show_cargo_in_vehicle_lists = true
+show_date_in_logs = false
+settings_restriction_mode = 2
+developer = 1
+newgrf_developer_tools = false
+ai_developer_tools = false
+scenario_developer = false
+newgrf_show_old_versions = false
+newgrf_default_palette = 1
+console_backlog_timeout = 100
+console_backlog_length = 100
+refresh_rate = 60
+fast_forward_speed_limit = 2500
+network_chat_box_width_pct = 40
+network_chat_box_height = 25
+network_chat_timeout = 20
+scale_bevels = true
+
+[linkgraph]
+recalc_interval = 4
+recalc_time = 10
+distribution_pax = 2
+distribution_mail = 1
+distribution_armoured = 1
+distribution_default = 0
+accuracy = 16
+demand_distance = 100
+demand_size = 100
+short_path_saturation = 80
+
+[locale]
+currency = USD
+units_velocity = metric
+units_power = metric
+units_weight = metric
+units_volume = metric
+units_force = si
+units_height = metric
+digit_group_separator =
+digit_group_separator_currency =
+digit_decimal_separator =
+
+[sound]
+news_ticker = true
+news_full = true
+new_year = true
+confirm = true
+click_beep = true
+disaster = true
+vehicle = true
+ambient = true
+
+[music]
+playlist = 0
+music_vol = 50
+effect_vol = 100
+custom_1 = 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+custom_2 = 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+playing = true
+shuffle = false
+
+[news_display]
+arrival_player = full
+arrival_other = summarized
+accident = full
+accident_other = full
+company_info = full
+open = summarized
+close = summarized
+economy = full
+production_player = summarized
+production_other = summarized
+production_nobody = off
+advice = full
+new_vehicles = full
+acceptance = full
+subsidies = full
+general = full
+
+[pf]
+forbid_90_deg = true
+roadveh_queue = true
+pathfinder_for_trains = 2
+pathfinder_for_roadvehs = 2
+pathfinder_for_ships = 2
+reverse_at_signals = false
+wait_oneway_signal = 15
+wait_twoway_signal = 41
+wait_for_pbs_path = 30
+reserve_paths = false
+path_backoff_interval = 20
+npf.npf_max_search_nodes = 10000
+npf.npf_rail_firstred_penalty = 1000
+npf.npf_rail_firstred_exit_penalty = 10000
+npf.npf_rail_lastred_penalty = 1000
+npf.npf_rail_station_penalty = 100
+npf.npf_rail_slope_penalty = 100
+npf.npf_rail_curve_penalty = 100
+npf.npf_rail_depot_reverse_penalty = 5000
+npf.npf_rail_pbs_cross_penalty = 300
+npf.npf_rail_pbs_signal_back_penalty = 1500
+npf.npf_buoy_penalty = 200
+npf.npf_water_curve_penalty = 100
+npf.npf_road_curve_penalty = 100
+npf.npf_crossing_penalty = 300
+npf.npf_road_drive_through_penalty = 800
+npf.npf_road_dt_occupied_penalty = 800
+npf.npf_road_bay_occupied_penalty = 1500
+npf.maximum_go_to_depot_penalty = 2000
+yapf.disable_node_optimization = false
+yapf.max_search_nodes = 10000
+yapf.rail_firstred_twoway_eol = true
+yapf.rail_firstred_penalty = 1000
+yapf.rail_firstred_exit_penalty = 10000
+yapf.rail_lastred_penalty = 1000
+yapf.rail_lastred_exit_penalty = 10000
+yapf.rail_station_penalty = 1000
+yapf.rail_slope_penalty = 200
+yapf.rail_curve45_penalty = 100
+yapf.rail_curve90_penalty = 600
+yapf.rail_depot_reverse_penalty = 5000
+yapf.rail_crossing_penalty = 300
+yapf.rail_look_ahead_max_signals = 10
+yapf.rail_look_ahead_signal_p0 = 500
+yapf.rail_look_ahead_signal_p1 = -100
+yapf.rail_look_ahead_signal_p2 = 5
+yapf.rail_pbs_cross_penalty = 300
+yapf.rail_pbs_station_penalty = 800
+yapf.rail_pbs_signal_back_penalty = 1500
+yapf.rail_doubleslip_penalty = 100
+yapf.rail_longer_platform_penalty = 800
+yapf.rail_longer_platform_per_tile_penalty = 0
+yapf.rail_shorter_platform_penalty = 4000
+yapf.rail_shorter_platform_per_tile_penalty = 0
+yapf.road_slope_penalty = 200
+yapf.road_curve_penalty = 100
+yapf.road_crossing_penalty = 300
+yapf.road_stop_penalty = 800
+yapf.road_stop_occupied_penalty = 800
+yapf.road_stop_bay_occupied_penalty = 1500
+yapf.maximum_go_to_depot_penalty = 2000
+yapf.ship_curve45_penalty = 100
+yapf.ship_curve90_penalty = 600
+
+[script]
+settings_profile = easy
+script_max_opcode_till_suspend = 10000
+script_max_memory_megabytes = 1024
+
+[ai]
+ai_in_multiplayer = false
+ai_disable_veh_train = false
+ai_disable_veh_roadveh = false
+ai_disable_veh_aircraft = false
+ai_disable_veh_ship = false
+
+[game_creation]
+town_name = 21
+landscape = tropic
+heightmap_height = 30
+snow_line_height = 10
+snow_coverage = 50
+desert_coverage = 50
+starting_year = 1950
+ending_year = 0
+land_generator = 1
+oil_refinery_limit = 32
+tgen_smoothness = 2
+variety = 4
+generation_seed = 3624841968
+tree_placer = 2
+heightmap_rotation = 0
+se_flat_world_height = 1
+map_x = 11
+map_y = 11
+water_borders = 16
+custom_town_number = 1
+custom_industry_number = 1
+custom_terrain_type = 30
+custom_sea_level = 1
+min_river_length = 16
+river_route_random = 5
+amount_of_rivers = 3
+
+[construction]
+map_height_limit = 0
+build_on_slopes = true
+command_pause_level = 1
+terraform_per_64k_frames = 4194304
+terraform_frame_burst = 4096
+clear_per_64k_frames = 4194304
+clear_frame_burst = 4096
+tree_per_64k_frames = 4194304
+tree_frame_burst = 4096
+build_object_per_64k_frames = 2097152
+build_object_frame_burst = 2048
+autoslope = true
+extra_dynamite = true
+max_bridge_length = 128
+max_bridge_height = 32
+max_tunnel_length = 256
+train_signal_side = 2
+road_stop_on_town_road = true
+road_stop_on_competitor_road = true
+raw_industry_construction = 2
+industry_platform = 1
+freeform_edges = true
+extra_tree_placement = 2
+
+[currency]
+rate = 1
+separator = "."
+to_euro = 0
+prefix =
+suffix = " credits"
+
+[company]
+engine_renew = true
+engine_renew_months = 6
+engine_renew_money = 100000
+renew_keep_length = false
+
+[ai_players]
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+none = start_date=730
+
+[game_scripts]
+none =
+
+[newgrf]
+544D0101|05E8B3FA4ED62F1AEBF14B7554E0C635|2cc_trainsinnml-3.1/2ccts.grf = 4 4 1 1 1 1 1 1 1 1 1 1 1
+4A595001|BBA9F50E894D063E20773A66E15B8FAD|2cc_bus_set-v10/2ccbusset.grf = 4 3 3 7 6 7
+41570101|2D09741F074782C9B8C132A2BCD68153|2cc_cargo_trams-0.8r/2cc-trams-cargo-v0.8r-2021-03-24.grf =
+FBFB0010|910E27FA08080A404B80EA7E9A888B95|2cc_trams-0.9c/2cc-trams-v0.9c-2020-10-24.grf = 1 0
+4A430002|93EAC5F5396584B92D4C5F0AAAF3F6C5|industrial_stations_renewal-1.0.2/indstatr.grf = 0 0
+52455400|1600687C50C5AB1E72EDD487CAD50E2A|coded_by_aegir._artwork_by_aegir-1/ae_cityw.grf =
+52455300|37C0B839B13C4B18051580C81EEDF427|suburban_stations-1/ae_subuw.grf =
+52455200|0E5A9C5ACD2BCAF7FA0658C3F905A660|rural_stations-1/ae_ruraw.grf =
+F1250008|6A2E778BFF67AB76437696ED1C3C780A|firs_industry_replacement_set_4-4.15.1/firs.grf = 3 0 0 0 0 0 20 150 80 300 1
+56430001|2AD089EE6B73F25D79F286AD43765914|total_town_replacement_set-3.14/ttrs3w.grf = 1 0 2 1
+74677462|1D2A4E03D9F30922788C166254C27619|total_bridge_renewal_set-1.2/total_bridges.grf =
+46724E00|A9B0DA055A35907BFBCD2D2F3CA80C39|funny_english_town_names-1.4.1/funengnames.grf =
+454E2301|8E8621425BA455298B01CCDA22A0D2C6|north_korean_faces-1/dprkface.grf =
+
+[newgrf-static]
diff --git a/src/mappings.v b/src/mappings.v
new file mode 100644
index 0000000..4e9fad5
--- /dev/null
+++ b/src/mappings.v
@@ -0,0 +1,65 @@
+module main
+
+type MappingValue = Comment | Field
+
+[params]
+struct Field {
+	// The name of the field in openttd.cfg file.
+	// This is the thing OpenTTD seees.
+	name string [required]
+	// The docs for the field.
+	docs string [required]
+	// The value of the field.
+	value string [required]
+	// Transforms the value.
+	transformer fn (string) string = fn (s string) string {
+		return s
+	}
+}
+
+type Comment = string
+
+fn field(f Field) MappingValue {
+	return f
+}
+
+fn comment(c Comment) MappingValue {
+	return c
+}
+
+fn seconds_to_ticks(s string) string {
+	return (s.int() * 1000 / 30).str()
+}
+
+const mappings = {
+	'time_limits.maximum_initialization_time': field(
+		name: 'network.max_init_time'
+		docs: 'The time the client has to initialize the game in seconds.'
+		value: '5'
+		transformer: seconds_to_ticks
+	)
+	'time_limits.maximum_join_time':           field(
+		name: 'network.max_join_time'
+		docs: 'The time the client has to join the server in seconds.'
+		value: '20'
+		transformer: seconds_to_ticks
+	)
+	'time_limits.maximum_download_time':       field(
+		name: 'network.max_download_time'
+		docs: 'The time the client has to download the map in seconds.'
+		value: '300'
+		transformer: seconds_to_ticks
+	)
+	'time_limits.maximum_password_time':       field(
+		name: 'network.max_password_time'
+		docs: 'The time the client has to enter the server password in seconds.'
+		value: '600'
+		transformer: seconds_to_ticks
+	)
+	'time_limits.maximum_lag_time':            field(
+		name: 'network.max_lag_time'
+		docs: 'The time the client can lag behind the server in seconds.'
+		value: '20'
+		transformer: seconds_to_ticks
+	)
+}