Difference between revisions of "Ikari Warriors 2/Game Mechanics"
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[[Ikari_warriors_2]] | [[Ikari_warriors_2]] | ||
| + | ==Items== | ||
| + | There is room for 7 items in the inventory screen, but there are only 6 to be found in the game. (the names are from the manual) | ||
| + | * Earthquake* - Stuns all enemies on screen, but does not deal damage. No known use in a speedrun. | ||
| + | * Thunder power - All non-boss enemies on screen are defeated and boss enemies are dealt damage. During a brief period (3 frames) before the boss appears on screen, this attack can deal damage before the boss has been attributed health, effectively killing it instantly. This works on all bosses, but there are only 2 (known) locations of this item in the game. | ||
| + | * Wing power - Allows you to fly over objects, while still being vulnerable to enemy attacks. This method of movement also increases the speed. The wings disappear after a set amount of time or whenever you enter the menu (or shop). | ||
| + | * Armor power - For a certain amount of time, you're invincible to all damage. Anything, including bosses, that touches you will be dealt damage every 3rd frame (corresponding to the game running at 20 fps). There is one exception though. The 3rd boss has a protective helmet (or something) that is not affected by the armor. | ||
| + | * Arrow power - Shots an arrow vertically. Everything in its way is insta-killed, including bosses. There is only one arrow power in the game (confirmed by the manual). | ||
| + | * Life power - Restores to full health. | ||
| + | * Time power - Takes you "back in time" to the latest shop you visited. This will always bring you backwards in the game and has therefore no known uses in a speedrun (but surely for a score attack). | ||
| + | |||
==Movement speed== | ==Movement speed== | ||
All levels go from bottom to top of the screen so it's important to keep the vertical movement speed up as much as possible. Below ratios are with respect to the vertical speed.<br /> | All levels go from bottom to top of the screen so it's important to keep the vertical movement speed up as much as possible. Below ratios are with respect to the vertical speed.<br /> | ||
Revision as of 05:28, 14 February 2015
Contents
Items
There is room for 7 items in the inventory screen, but there are only 6 to be found in the game. (the names are from the manual)
- Earthquake* - Stuns all enemies on screen, but does not deal damage. No known use in a speedrun.
- Thunder power - All non-boss enemies on screen are defeated and boss enemies are dealt damage. During a brief period (3 frames) before the boss appears on screen, this attack can deal damage before the boss has been attributed health, effectively killing it instantly. This works on all bosses, but there are only 2 (known) locations of this item in the game.
- Wing power - Allows you to fly over objects, while still being vulnerable to enemy attacks. This method of movement also increases the speed. The wings disappear after a set amount of time or whenever you enter the menu (or shop).
- Armor power - For a certain amount of time, you're invincible to all damage. Anything, including bosses, that touches you will be dealt damage every 3rd frame (corresponding to the game running at 20 fps). There is one exception though. The 3rd boss has a protective helmet (or something) that is not affected by the armor.
- Arrow power - Shots an arrow vertically. Everything in its way is insta-killed, including bosses. There is only one arrow power in the game (confirmed by the manual).
- Life power - Restores to full health.
- Time power - Takes you "back in time" to the latest shop you visited. This will always bring you backwards in the game and has therefore no known uses in a speedrun (but surely for a score attack).
Movement speed
All levels go from bottom to top of the screen so it's important to keep the vertical movement speed up as much as possible. Below ratios are with respect to the vertical speed.
Diagonal/Straight flying speed ~76%
Diagonal/Straight walking speed (land) ~72%
Diagonal/Straight walking speed (water) ~69%
Straight walking (land)/flying speed ~68%
Straight walking (water)/walking (land) speed ~68%
In practice, as an example, this means that a quick twitch diagonally right (or left) to shoot an enemy when walking on land incurs a time loss of roughly 3-5 frames.
Galago tunnels
The Galago tunnels are the passages between levels. They can either be filled with weapons or enemies. It's obviously best if they are filled with weapon items... However, it's not fully understood what determines this. Below are some empirical observations.
- A test consisting of 10 playthroughs of the first level resulted in monsters in the tunnel 5 times.
- By entering the tunnel from a save state "close" to the entrance, you'll always get the same result (the same is true for all levels). By starting from a save state further and further away, you'll eventually start to sometimes get monsters, sometimes weapon items. A more detailed study would clearly be needed to determine the exact trigger and if it's something that can be manipulated in real-time.
- The second tunnel seems to always be the same as the first tunnel (so if there are monsters in the first tunnel, there will be monsters in the second tunnel as well).
- A test consisting of 10 playthroughs of level 3 resulted in monsters 9 of the times if there had also been monsters in the level 2 tunnel. The same test, but from a save state without monsters in tunnel 2 only gave monsters once.
- A test consisting of 10 playthroughs of level 4 resulted in monsters 6 of the times if there had also been monsters in the level 2 tunnel. The same test, but from a save state without monsters in tunnel 3 gave monsters 4 times.
- Some preliminary tests on if the first tunnel spawns depended on score, heart count or hard resets didn't yield anything (same score/heart count/hard reset can give both monsters and weapon items).
In summary, the first tunnel seems to be a 50/50 chance and at the time of writing this it's not known if this can be manipulated. There is a very high probability that tunnel 2 and 3 will have the same content as level 1. Level 4 seems to be more random, but maybe with slight preference for the same content as in the previous levels. All of the playthroughs in the tests above used the speedrun route and were played on emulator. However, the play quality varied quite a bit, so it's impossible to say what determined monsters in the tunnels. The tests do however correspond very closely to the general hunch gained from speedrun attempts on console.
It's possible to get through the first three tunnels unscathed with only minor time losses compared to when there are no monsters. There hasn't been found a way yet to get through tunnel 4 when it's filled with monsters though.
1st tunnel - http://www.youtube.com/watch?v=R2sC4KABllc
2nd tunnel - http://www.youtube.com/watch?v=U60P6yoW9aU
3rd tunnel - http://www.youtube.com/watch?v=ldFa-nxpJg4
Weapons
Switching weapons costs roughly 1.5 seconds (provided you've already planned a trip to the menu). While the boomerangs are incredibly overpowered, they don't save anywhere near that time any place in the game. The bazooka is powerful and even deals damage to bosses, but does so more slowly than the special items (robot armor, arrow and lightning quick kill). The sword is somewhat interesting to play with casually, but have no impact in a speedrun. The mines are rubbish. The fastest way is simply to play with the machine gun (B-button) and the grenades (A-button) the whole game. All weapons can be upgraded three times by collecting the respective weapon tokens (longer reach, bigger explosion area etc). The effects of upgrading the weapons make no difference in a speedrun though.
