TI-99/4A Super Space Acer:

Normal Game:
If you have the UberGROM version, high scores and settings are saved on the cart.

Attract Mode:
- you can abort attract mode screens with FIRE or '0'
- you can end the title page delay by pressing '0'

In game:
- Last digit of score reflects the game mode:
0 = normal game
1 = GNAT
2 = SELENA
3 = CLOAKED ENEMIES
9 = CHEAT MODE

On main menu:
- Q,W,E also work in place of 1,2,3
- Hold FIRE while moving left or right to change ships to gain access to GNAT and SELENA
- Hold down while selecting SNOWBALL to play CLOAKED ENEMY mode

- Hold UP while starting to enable cheat mode. You will be invincible. Once in game:
'0' to turn off shield
'2' to increase shields
'3' to increase lives
'5' to warp immediately to boss
'6' to increase weapon power
'7' to immediately kill the boss
'8' to disable cheat mode

In Sound Test:
- DOWN + 0 to jump to win sequence (select ship before entering)

https://www.arcadeshopper.com/wp/store/#!/Super-Space-Acer-2024-limited-edition/p/755974759/category=0

https://harmlesslion.com/software/classic99/

ColecoVision Super Space Acer - Exclusively at CollectorVision, though I've no idea if they even sold it as I got no feedback ;)

Attract Mode:
- abort attract mode screens with FIRE or '0'
- end the title page delay by pressing '0'

In game:
- Last digit of score reflects the game mode:
0 = normal game
1 = GNAT
2 = SELENA
3 = CLOAKED ENEMIES
9 = CHEAT MODE

On main menu:
- '*' to enter sound test
- '#' to toggle music on and off (SFX instead)
- FIRE while moving left or right to change ships to gain access to GNAT and SELENA
- DOWN while selecting SNOWBALL to play CLOAKED ENEMY mode

- UP while selecting difficulty to enable cheat mode. You will be invincible. Once in game:
'0' to turn off shield
'2' to increase shields
'3' to increase lives
'5' to warp immediately to boss
'6' to increase weapon power
'7' to immediately kill the boss
'8' to disable cheat mode

In Sound Test:
- hold DOWN and press 0 to jump to win sequence (select ship before entering)

https://collectorvision.com/games/superspaceacer.php

GBA Super Space Acer - ROM at Itch.io or contact me for a physical copy

Attract Mode:
- abort attract mode screens with A or START
- end the title page delay by pressing SELECT

Normal Play:
- SRAM save scores and unlocks
- No unlocks on easy
- Win with min weapon or 3 main ships for GNAT
- Win with max weapon or other 4 ships for SELENA
- Win with all 5 ships for CLOAKED ENEMY mode

In game:
- Last digit of score reflects the game mode:
0 = normal game
1 = GNAT
2 = SELENA
3 = CLOAKED ENEMIES
9 = CHEAT MODE

On main menu:
- Hold A on ship select for early access to GNAT and SELENA
- DOWN while selecting SNOWBALL to play CLOAKED ENEMY mode (or unlock)
- UP plus START for cheat mode. You will be invincible. Once in game, hold R plus:
UP to warp to boss
DOWN to increase weapon power
LEFT to kill the boss
RIGHT to end cheat mode

In Sound Test:
- Select SFX#9, RIGHT and A to jump to win sequence
- hold START, L or R while selecting a song to hear alternate tunes

https://tursilion.itch.io/super-space-acer-gba