Gravity Games for retro consoles

Unlike "Thrust" genre games, these are side-view games with gravity that allows you to move your ship up, down, left, and right in the air freely,
but does not allow you to rotate your ship vertically (clockwise or counterclockwise).
Although the “genre name” of this field is not specified in particular,
it is an undeniable fact that the works that fall into this field are included in the work group classified into the following categories.

Caving Missions	A group of games that advances through a cave-shaped intricate map. The main purpose is to battle with the enemy and reach the goal. The oldest work is the "Fort Apocalypse", which was released in 1982 on Atari 8bit hobby PCs and C64. This category is further divided into two types depending on whether there is a penalty (death, damage, etc.) when touching the terrain. Works without penalties (generally called "Cybernoid type") will not be dealt with on this page ("Deep Core Raider", etc.). Of course, games without gravity are also excluded ("Aquanaut", "Cavitas", etc.).
Space Taxi	Games in which customers are picked up and transported to a designated location; the C64's "Space Taxi" was started in 1984. They already included maps that were more intricate than the "Caving Missions" category.
Lander	Games that aim to land on a designated place while controlling the falling aircraft. A category of historical significance that became a hit in the 1970s, it influenced the 1982 arcade game "Gravitar" (the ancestor of the "Thrust" genre of games). However, we will only be dealing with titles that do not allow you to rotate your aircraft (clockwise or counterclockwise).
Choplifter	Games where you defeat enemies in a spacious map that scrolls back and forth. Their ancestor was the "Choplifter", which was released for the Apple II in 1982, but they are similar to the 1980 arcade "Defender", that is a genuine STG genre, which maps are not complicated. So they are far from the purpose of this site, which is to make your own machine work accurately at the dot level, and they are not covered on this page.

Titles

Genre	Title name	Released for:	Year	Now free?	Where to download:	Levels	PW	Continue	Lives	Ctrl	Tag
Caving Missions	Activity For Employment	MSX2	1990	Coverware	--	9	no	0	4	I
Caving Missions	Airwolf	Spectrum48k	1984	no	--	1	no	0	5	II
Caving Missions	Alco-Copter	Amiga	2018	Freeware	pouet.net	30	no	0	5	II
Caving Missions	Attention!	MSX2	1994	Coverware	--	-	no	0	1	I
Caving Missions	Concentration	MSX2	1992	Coverware	--	-	no	0	1	I
Caving Missions	Fortress	Amiga	1993	no (Permitted.)	aminet.net	?	no	0	5	III
Caving Missions	Fortress Underground	Amiga	1987	no	--	9	no	0	6	I	ESP
Caving Missions	Kin to Gin no Tamago	MSX2	1991	Coverware	--	8	no	Free	4	I
Caving Missions	Home For ZXMas	Spectrum48k	2021	Freeware	Spectrum Computing	18	no	Free	1	I
Caving Missions	It's The Pits!	Amiga	1995	Shareware	AmigaFuture	4	no	0	1	I
Caving Missions	Kaiju Feeder	Gameboy	2019	Freeware	Author's webpage	3	no	Free	1	I
Caving Missions	Mercury Mission	Amiga	1994	Freeware	Games-Coffer	10	no	0	3	I
Caving Missions	Mission Underground	Amiga	1989	no (Permitted.)	Amiga Lore	1	no	0	3	III
Caving Missions	Rescue (in "Gamer's Delight")	CD32	1994	no	--	17	no	0	3	II	ESP
Caving Missions	Sentakki Action	MSX1	1992	Coverware	--	1	no	0	1	I
Caving Missions	Spaceport	Amiga	1987	no	--	2	no	0	6	III	ESP
Caving Missions	Survivor	Amiga	1997	Freeware	EAB file server	6	no	0	6	I
Caving Missions	Tractor Beam	Amiga	1992	Freeware	EAB file server	10	Yes	Free	3	I
Caving Missions	Yoppal	MSX2	1989	Coverware	--	8	no	Free	1	I
Caving Missions	Yopparai Special	MSX2	1991	Coverware	--	-	no	0	1	I
Caving Missions	Yurayura Yupon	MSX2	1997	Coverware	--	1	no	Free	1	I
Caving Missions	Zzzep	Amiga	1990	Freeware	Games-Coffer	2	no	0	2	III	ESP
Space Taxi	airTAXI	Amiga	1994	Freeware	Author's website	14	no	0	5	I
Space Taxi	Hello Taxi	Amiga	1997	Freeware		6	no	0	--	I	ESP
Space Taxi	Rescue Lander	Spectrum48k	2015	Freeware	Official forum	12	no	0	5	I
Space Taxi	Sky Cabbie	Amiga	1991	no	--	24	no	0	10	II	ESP
Space Taxi	Space Taxi (Effect)	Amiga	199X	Freeware	Games-Coffer	12	no	0	3	I
Space Taxi	Space Taxi	Amiga	1994	Freeware	AmigaFuture	10	Select	0	5	I
Space Taxi	Space Taxi 2	Amiga	1995	Freeware	AmigaFuture	33	Select	0	5	I
Space Taxi	Space Taxi 3	Amiga	1996	Freeware	Games-Coffer	49	Select	0	5	I
Space Taxi	Taxi (in "Gamer's Delight 2")	Amiga	1995	no	--	10	no	0	3	I
Space Taxi	Ugh!	Amiga	1992	no	--	69	Yes	no	3	I
Lander	Coloco	Spectrum48k	2020	Freeware	Author's website	30	no	0	15	I
Lander	Difficult Landing	MSX2	1991	Coverware	--	-	no	0	1	I
Lander	IngLand	Amiga	1998	Freeware	aminet.net	3	no	0	5	I
Lander	Lander1	SMS	2013	Freeware	smspower.org	5	no	Free	1	I
Lander	Lander2	SMS	2015	Freeware	smspower.org	11	no	0	5	I
Lander	Lander 3DX	Amiga	1991	Freeware	aminet.net	3	Select	Free	1	I
Lander	Landers	Amiga	2002	Freeware	aminet.net	3	no	0	1	I
Lander	Planet Fall	Amiga	1994	Freeware	AmigaFuture	2	no	0	1	I
Lander	SpaceCat	MSX1	2022	Freeware	msxdev.org	24	no	Free	1	I
Lander	Spod	MSX1	1988	Coverware	--	-	no	0	1	I
Lander	To the Moon	Amiga	1999	Freeware	aminet.net	14	no	0	4	I

Description:

Background color of "Released for:" column depends on how difficult to load the game on retro consoles.
Amiga, ZX Spectrum and MSX games can be loaded on CD32+FDD. (Details for Amiga games and ZX Spectrum games)
GB & SMS freeware and snapshot files of ZX Spectrum 48k can be loaded on SNES+AD Adapter(White version). (Details)
Except for them, we have to use the console which the game was originally designed for.
Note: "SpaceCat" needs original BIOS for MSXAdvance.( Choose "Ascii8k" for mapper.)

Levels: It shows how many levels in total.
PW: Password is available? (Yes / no) ......"Select" means you can restart the game from any level (not as cheat).
Continue: Continue system is available after your all lives run out? (Yes / no) ..."Free" means you can continue unlimitedly.
Lives: It means how many lives you have till you get "Game Over" or "Continue" screen?
Ctrl: Control complexity based on this site. Don't confuse it with the difficulty completing the game. See below:

I	To make your character move to the right/left, just press right/left of the direction pad.
II	You can rotate around the Y-axis(horizontally). It would be relatively easy to turn.
III	You can rotate around the Y-axis(horizontally), however, it would be relatively difficult. If depressing force of your left thumb is relatively small, your character would just move forward / backward without turning. If depressing force of your left thumb is relatively big, your character would turn right/left immediately even if it wouldn't be your intention.

Tag: "Esp" tag means that it is nearly impossible for a normal human to complete the game without cheating /saving state.
        If you think you're the chosen one, go ahead!

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Exclusion:
1. Following Amiga titles never work on 020 system, so they would not be listed until anyone complete WHDLoad slaves:
    "Escape from Jovi", "Galactic Taxi"
2. Following Amiga titles never work on CD32+FDD system, so they would not be listed:
    "watchNplay" (It contains 2 workbench games of this genre, "ColorLander" and "Spaceascii".)
3. Following game are not listed yet because I don't have enough information (not tested).
    "Space Cab"(Amiga in 1991)
4. We never list Windows / modern consoles/smart phones titles even if they're well-done freeware.
     It is because we are interested in only games which we can play on our retro consoles.
     If you're OK even if you cannot play the game on your retro consoles, don't miss out.

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