Beer Run
lives in $621F
$1E20: CE 1F 62     DEC $621F
$6D5C: EE 1F 62     INC $621F
$7354: EE 1F 62     INC $621F
$7D5C: EE 1F 62     INC $621F

Bouncing Kamungas
lives in $0213
$69DC: CE 13 02     DEC $0213
$6C9A: EE 13 02     INC $0213
$6C9D: EE 13 02     INC $0213

Brainteaser Blvd
lives in $74
$1338: C6 74        DEC $74
$10A8: E6 74        INC $74

Crazy Mazey
lives in $0326
$0EC2: CE 26 03     DEC $0326
$1105: EE 26 03     INC $0326

Crossfire
lives in $4C1F but copied from $4C16
$4785: E9 01        SBC #$01 -> E9 00
$4940: 69 00        ADC #$00 -> 24 00
$49AF: 69 01        ADC #$01 -> 69 00
$569A: 69 01        ADC #$01 -> 69 00

Defender
lives in $9E
$7579: C6 9E        DEC $9E -> A5 9E
$6567: E6 9E        INC $9E -> A5 9E

Diamond Mine
lives in $B9
$1112: D6 B9        DEC $B9,X -> B5 B9   LDA $B9,X
$0940: F6 B9        INC $B9,X -> B5 B9   LDA $B9,X
(incomplete)

Eggs-It
lives in $7801
$962A: CE 01 78 -> AD

Free Fall
lives in $1532
$0E19: CE 32 15 -> AD 32 15
$19F2: CE 32 15 -> AD
$0E69: EE 32 15 -> AD
$7E11: EE 32 15
$BE11: EE 32 15

Gamma Goblins
lives in $06FE
$4EF3: CE FE 06 -> AD FE 06
$7F61: 69 02    -> 69 00

Genetic Drift
lives in $10
$5846: 85 10    -> A5 10

Gold Rush
lives in $0A33, capped at 9
$13EE: CE 33 0A -> AD 33 0A

Gorgon
lives in $70
$A5B0: C6 70    -> A5 70

Gremlins
lives in $76 and $084A,X (0/1 for player 1/2)
$54B2: C6 76    -> A5 76
$54B6: DE 4A 08 -> BD 4A 08
$5165: E6 76    -> A5 76
$5162: FE 4A 08 -> BD 4A 08

HERO
lives in $28, capped at 6
bombs in $29 but the routine that gives you bonus points at the end of the level assumes that they decrement otherwise you get bonus points forever and never get to advance to the next level :(
$6387: C6 28    -> A5 28 to never decrease lives
$70BC: F0 33    -> 24 33 to allow planting bombs even if you don't have any

Lancaster
lives in $0ED7
$1661: CE D7 0E -> AD D7 0E
$1476: EE D7 0E -> AD D7 0E

Lazer Silk
lives in $CE
$7BA0: C6 CE    -> A5 CE
$806A: E6 CE    -> A5 CE

Up'n Down
lives in $1B,X (X=0/1 for player 1/2)
$0912: D6 1B    -> B5 1B

Hungry Boy
lives in $B6
$70F4: C6 B6    -> A5 B6

Hyper Head On
lives in $79
$04B0: C6 79    -> A5 79
$05FB: E6 79    -> A5 79

Sammy Lightfoot
lives in $734E (player 1), $734F (player 2)
$7B8B: CE 4E 73 -> AD 4E 73
$7B81: CE 4F 73 -> AD 4F 73

Serpentine
lives in $D8 (capped at 3)
$868F: C6 D8    -> A5 D8

Jumpman
lives in $B7
$8FF3: C6 B7    -> A5 B7
$93B1: C6 B7    -> A5 B7
$A598: E6 B7    -> A5 B7

Kid Niki
lives in $084A
$BD34: CE 4A 08 -> AD 4A 08

Lady Tut
lives in $07
$76AC: C6 07    -> A5 07

Pooyan
lives in $0F82,X (X=0/1 for player 1/2)
$7D7E: DE 82 0F -> BD 82 0F
$7D9A: DE 82 0F -> BD 82 0F
$758A: FE 82 0F -> BD 82 0F

Twerps
lives in $14FE
$0640: CE FE 14 -> AD FE 14
$0774: CE FE 14 -> AD FE 14
$0F05: CE FE 14 -> AD FE 14

Spy's Demise
lives in $17
$6D8A: C6 17    -> A5 17
$6DD0: E6 17    -> A5 17

Xevious
lives in $602B
$6414: CE 2B 60 -> AD 2B 60
$6A8C: EE 2B 60 -> AD 2B 60
$750D: EE 2B 60 -> AD 2B 60
$894F: EE 2B 60 -> AD 2B 60

Threshold
lives in $778F
$45B0: CE 8F 77 -> AD 8F 77
$7ECD: EE 8F 77 -> AD 8F 77

Tubeway ][
lives in $A3
$9083: C6 A3    -> A5 A3
$A1FA: E6 A3    -> A5 A3
$A735: E6 A3    -> A5 A3

Mr. Robot
lives in $EF
$777B: E9 01    -> E9 00
$78C4: 69 01    -> 69 00

Lode Runner
lives in $98, capped at 255
$613F: C6 98    -> A5 98

Championship Lode runner
lives in $7D, capped at 255
$61AB: C6 7D    -> A5 7D
$60DD: A9 05    -> A9 FF to start with 255 lives

Spy Hunter
reset vector to $100:
$0D8E: E8 -> 00
$0D93: 0B -> 01