Cobra Gunship - All Missions, Hard (Mac, 1997)

Описание: A full playthrough on Hard difficulty of Cobra Gunship, a helicopter side-scroller for Mac and DOS, by Elysium Digital in 1997.
This is version 1.3.3 of the Mac version, played in a modified QEMU to get working sound and video/audio/keyboard capture.

Played and recorded at 60*408/407 FPS (~60.147420 FPS). Slowed down to 60 FPS (and audio proportionally) for YouTube.
Each mission was recorded separately, except 14 and 15, which were recorded together. I sped up the loading screen in this video.

I modified the game binary and sound assets to implement the following changes:
Fixed unstable FPS, to run at a solid 30 (*408/407, because of Mac legacy) FPS. The game had a stupid, complicated, unnecessary, and ineffective floating-point algorithm for trying to run at 30 (*408/407) FPS which caused constant FPS fluctuations. This choppiness is visible in other Cobra Gunship videos.
Fixed broken sound saturation code. When sound got too loud, it would *wrap*, not clip. You can hear pop sounds when this happens in other Cobra Gunship videos.
Changed sound to output at 1/2 the original volume, for less/no clipping. (The game's Sound Volume setting in Audio Options sets hardware volume, not software mixing volume.)
Replaced nearest-neighbor interpolation in the sound mixing with a linear interpolation implementation.
Preconverted all game sounds to 8x the original sample rate (from 22050 Hz to 176400 Hz).

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The game's difficulty affects only the damage you take: half damage on Easy, and double damage on Hard. On Hard, the damage from mines will kill you from max health.

Cash drops are random. If you play without retrying missions for more cash, you'll find yourself forced to buy mediocre upgrades just to progress, perpetuating your cash shortage into future missions. My strategy was to retry the first few missions until I collected enough cash to go straight for the Flame Thrower, best engine, and then best armor.

The weapons that are initially selected when starting a mission are the last ones you had selected in-game, or the last weapon/launcher you bought, and isn't stored to or loaded from your save file. (If I had continued onto Mission 30 directly after purchasing my final upgrades, I would have had Lasers/Heatseekers selected.)
When you start a mission, the direction you are facing and whether or not you are rotating and your initial number of invulnerability frames is carried forward from the last in-game state (the end of the last mission you played), UNLESS you load a game in between, in which case you start facing to the right, with about 2 seconds of invulnerability.

0:58 Mission 0
1:58 Mission 3 (destroy base)
4:21 Mission 2 (SAMs)
6:32 Mission 7 (destroy war factory)
7:59 Mission 4 (convoy v1)
10:43 Flame Thrower
10:44 Mission 1 (AA guns)
11:48 Mission 5 (planes, mines, 1 blimp)
14:08 Mission 8 (convoy v2: protect haven from saboteurs)
15:35 Best Engine
15:37 Mission 6 (splitting convoy)
17:03 Mission 12 (glass cannon: destroy retreating convoy)
18:43 Best Armor
18:45 Mission 10 (rescue 9 saboteurs)
20:04 Drop Rockets
20:08 Mission 9 (destroy 3 bunkers)
21:01 Mission 13 (airlift 12 saboteurs)
23:39 Mission 11 (destroy 1 blimp)
24:02 Armor Ranking, Repair Crew
24:05 Mission 14 (destroy all planes)
24:48 Mission 15 (destroy 1 special chopper)
25:05 Mission 16 (protect at least 3 of 4 havens)
26:24 Here, I show that if you are short on cash, you can eliminate everything except the 5 troop choppers, then indefinitely farm the paratroopers for cash.
27:33 Mission 17 (rescue 2 saboteurs)
28:11 Mission 18 (destroy 10 tan choppers)
28:54 Radar De-Jammer
28:56 Mission 19 (drop rockets v1)
29:17 Mission 20 (destroy a bridge)
30:16 Mission 21 (destroy fuel depots v1)
When drop rockets go all the way across the map, they can hit vehicles or troops, but somehow won't hit blimps, AA guns, SAMs, or fuel depots.
30:55 Mission 22 (destroy generated planes and choppers)
32:50 Mission 23 (drop rockets v2: kill all saboteurs before they destroy haven)
33:10 Mission 24 (drop rockets v3: destroy all vehicles before they reach base)
33:32 Napalm
33:35 Mission 25 (don't destroy trucks)
34:09 Mission 26 (destroy fuel depots v2)
34:26 You must go past this mine to hit the farthest fuel depot with drop rockets.
34:34 Audio underrun.
34:51 Floaters
34:53 Mission 27 (allow tan vehicles to pass)
35:08 Damage boost off the machine gun fire to clear some of the mine wall.
36:20 Pressed the wrong key, destroyed the truck late, causing a traffic jam.
38:47 Mission 28 (covert)
39:27 Mission 29 (destroy all buildings)
39:55 Hit the bunker's rocket to damage boost through the mines.
40:38 Buy Everything Else (with $126 left)
41:01 Mission 30 (protect all havens)