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Play Marine Boy (English) Online

Marine Boy

Play Marine Boy online. Descend toward the mermaid while avoiding sea creatures and watching the oxygen reserve.

Browser play

Arcade — EmulatorJS controls

Default Player 1 keyboard mapping. Change keys in Controller Settings.

Console button	Keyboard
↑ / ↓ / ← / →	↑ / ↓ / ← / →
RetroPad A / B / X / Y	Z / X / A / S
L / R	Q / E
Insert coin	V
START	Enter

Open Controller Settings to configure your keyboard or gamepad. Touch controls are available on mobile.

How to Play Marine Boy

Quick start

Guide the diver downward through the animals.
Use the attack when a creature blocks the route.
Collect small mermaids when the detour is safe.
Reach the bottom mermaid before oxygen runs out.

Controls

Directional control: guide the diver. Attack action: use the diver’s weapon against threatening sea creatures. Watch the oxygen indicator while choosing the route.

Marine Boy — About this game

Marine Boy asks its diver to reach the mermaid at the bottom of the sea while avoiding hostile animals. Some creatures slow the descent, while others attack directly. The remaining oxygen limits how long the diver can spend on the route, making a safe detour useful only if it still leaves enough time to finish. Smaller mermaids collected on the way contribute to the reward for the oxygen remaining at the destination. Reaching the final shell begins another, more difficult dive.

Cheats

Infinite Credits

1 "开启", 0, 0x8002, 0x63

Infinite Lives PL1

1 "开启", 0, 0x8031, 0x09

Select Starting Stage PL1

1 "1", 0, 0x802F, 0xFF, 0, 0x802F, 0x01
2 "2", 0, 0x802F, 0xFF, 0, 0x802F, 0x02
3 "3", 0, 0x802F, 0xFF, 0, 0x802F, 0x03
4 "4", 0, 0x802F, 0xFF, 0, 0x802F, 0x04
5 "5", 0, 0x802F, 0xFF, 0, 0x802F, 0x05
6 "6", 0, 0x802F, 0xFF, 0, 0x802F, 0x06
7 "7", 0, 0x802F, 0xFF, 0, 0x802F, 0x07
8 "8", 0, 0x802F, 0xFF, 0, 0x802F, 0x08
9 "9", 0, 0x802F, 0xFF, 0, 0x802F, 0x09
10 "10", 0, 0x802F, 0xFF, 0, 0x802F, 0x0A
11 "11", 0, 0x802F, 0xFF, 0, 0x802F, 0x0B
12 "12", 0, 0x802F, 0xFF, 0, 0x802F, 0x0C
13 "13", 0, 0x802F, 0xFF, 0, 0x802F, 0x0D
14 "14", 0, 0x802F, 0xFF, 0, 0x802F, 0x0E
15 "15", 0, 0x802F, 0xFF, 0, 0x802F, 0x0F
16 "16", 0, 0x802F, 0xFF, 0, 0x802F, 0x10
17 "17", 0, 0x802F, 0xFF, 0, 0x802F, 0x11
18 "18", 0, 0x802F, 0xFF, 0, 0x802F, 0x12
19 "19", 0, 0x802F, 0xFF, 0, 0x802F, 0x13
20 "20", 0, 0x802F, 0xFF, 0, 0x802F, 0x14
21 "21", 0, 0x802F, 0xFF, 0, 0x802F, 0x15
22 "22", 0, 0x802F, 0xFF, 0, 0x802F, 0x16
23 "23", 0, 0x802F, 0xFF, 0, 0x802F, 0x17
24 "24", 0, 0x802F, 0xFF, 0, 0x802F, 0x18
25 "25", 0, 0x802F, 0xFF, 0, 0x802F, 0x19
26 "26", 0, 0x802F, 0xFF, 0, 0x802F, 0x1A
27 "27", 0, 0x802F, 0xFF, 0, 0x802F, 0x1B
28 "28", 0, 0x802F, 0xFF, 0, 0x802F, 0x1C
29 "29", 0, 0x802F, 0xFF, 0, 0x802F, 0x1D
30 "30", 0, 0x802F, 0xFF, 0, 0x802F, 0x1E
31 "31", 0, 0x802F, 0xFF, 0, 0x802F, 0x1F
32 "32", 0, 0x802F, 0xFF, 0, 0x802F, 0x20
33 "33", 0, 0x802F, 0xFF, 0, 0x802F, 0x21
34 "34", 0, 0x802F, 0xFF, 0, 0x802F, 0x22
35 "35", 0, 0x802F, 0xFF, 0, 0x802F, 0x23
36 "36", 0, 0x802F, 0xFF, 0, 0x802F, 0x24
37 "37", 0, 0x802F, 0xFF, 0, 0x802F, 0x25
38 "38", 0, 0x802F, 0xFF, 0, 0x802F, 0x26
39 "39", 0, 0x802F, 0xFF, 0, 0x802F, 0x27
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42 "42", 0, 0x802F, 0xFF, 0, 0x802F, 0x2A
43 "43", 0, 0x802F, 0xFF, 0, 0x802F, 0x2B
44 "44", 0, 0x802F, 0xFF, 0, 0x802F, 0x2C
45 "45", 0, 0x802F, 0xFF, 0, 0x802F, 0x2D
46 "46", 0, 0x802F, 0xFF, 0, 0x802F, 0x2E
47 "47", 0, 0x802F, 0xFF, 0, 0x802F, 0x2F
48 "48", 0, 0x802F, 0xFF, 0, 0x802F, 0x30
49 "49", 0, 0x802F, 0xFF, 0, 0x802F, 0x31
50 "50", 0, 0x802F, 0xFF, 0, 0x802F, 0x32
51 "51", 0, 0x802F, 0xFF, 0, 0x802F, 0x33
52 "52", 0, 0x802F, 0xFF, 0, 0x802F, 0x34
53 "53", 0, 0x802F, 0xFF, 0, 0x802F, 0x35
54 "54", 0, 0x802F, 0xFF, 0, 0x802F, 0x36
55 "55", 0, 0x802F, 0xFF, 0, 0x802F, 0x37
56 "56", 0, 0x802F, 0xFF, 0, 0x802F, 0x38
57 "57", 0, 0x802F, 0xFF, 0, 0x802F, 0x39
58 "58", 0, 0x802F, 0xFF, 0, 0x802F, 0x3A
59 "59", 0, 0x802F, 0xFF, 0, 0x802F, 0x3B
60 "60", 0, 0x802F, 0xFF, 0, 0x802F, 0x3C
61 "61", 0, 0x802F, 0xFF, 0, 0x802F, 0x3D
62 "62", 0, 0x802F, 0xFF, 0, 0x802F, 0x3E
63 "63", 0, 0x802F, 0xFF, 0, 0x802F, 0x3F
64 "64", 0, 0x802F, 0xFF, 0, 0x802F, 0x40
65 "65", 0, 0x802F, 0xFF, 0, 0x802F, 0x41
66 "66", 0, 0x802F, 0xFF, 0, 0x802F, 0x42
67 "67", 0, 0x802F, 0xFF, 0, 0x802F, 0x43
68 "68", 0, 0x802F, 0xFF, 0, 0x802F, 0x44
69 "69", 0, 0x802F, 0xFF, 0, 0x802F, 0x45
70 "70", 0, 0x802F, 0xFF, 0, 0x802F, 0x46
71 "71", 0, 0x802F, 0xFF, 0, 0x802F, 0x47
72 "72", 0, 0x802F, 0xFF, 0, 0x802F, 0x48
73 "73", 0, 0x802F, 0xFF, 0, 0x802F, 0x49
74 "74", 0, 0x802F, 0xFF, 0, 0x802F, 0x4A
75 "75", 0, 0x802F, 0xFF, 0, 0x802F, 0x4B
76 "76", 0, 0x802F, 0xFF, 0, 0x802F, 0x4C
77 "77", 0, 0x802F, 0xFF, 0, 0x802F, 0x4D
78 "78", 0, 0x802F, 0xFF, 0, 0x802F, 0x4E
79 "79", 0, 0x802F, 0xFF, 0, 0x802F, 0x4F
80 "80", 0, 0x802F, 0xFF, 0, 0x802F, 0x50
81 "81", 0, 0x802F, 0xFF, 0, 0x802F, 0x51
82 "82", 0, 0x802F, 0xFF, 0, 0x802F, 0x52
83 "83", 0, 0x802F, 0xFF, 0, 0x802F, 0x53
84 "84", 0, 0x802F, 0xFF, 0, 0x802F, 0x54
85 "85", 0, 0x802F, 0xFF, 0, 0x802F, 0x55
86 "86", 0, 0x802F, 0xFF, 0, 0x802F, 0x56
87 "87", 0, 0x802F, 0xFF, 0, 0x802F, 0x57
88 "88", 0, 0x802F, 0xFF, 0, 0x802F, 0x58
89 "89", 0, 0x802F, 0xFF, 0, 0x802F, 0x59
90 "90", 0, 0x802F, 0xFF, 0, 0x802F, 0x5A
91 "91", 0, 0x802F, 0xFF, 0, 0x802F, 0x5B
92 "92", 0, 0x802F, 0xFF, 0, 0x802F, 0x5C
93 "93", 0, 0x802F, 0xFF, 0, 0x802F, 0x5D
94 "94", 0, 0x802F, 0xFF, 0, 0x802F, 0x5E
95 "95", 0, 0x802F, 0xFF, 0, 0x802F, 0x5F
96 "96", 0, 0x802F, 0xFF, 0, 0x802F, 0x60
97 "97", 0, 0x802F, 0xFF, 0, 0x802F, 0x61
98 "98", 0, 0x802F, 0xFF, 0, 0x802F, 0x62

Infinite Lives PL2

1 "开启", 0, 0x8032, 0x09

Select Starting Stage PL2

1 "1", 0, 0x8030, 0xFF, 0, 0x8030, 0x01
2 "2", 0, 0x8030, 0xFF, 0, 0x8030, 0x02
3 "3", 0, 0x8030, 0xFF, 0, 0x8030, 0x03
4 "4", 0, 0x8030, 0xFF, 0, 0x8030, 0x04
5 "5", 0, 0x8030, 0xFF, 0, 0x8030, 0x05
6 "6", 0, 0x8030, 0xFF, 0, 0x8030, 0x06
7 "7", 0, 0x8030, 0xFF, 0, 0x8030, 0x07
8 "8", 0, 0x8030, 0xFF, 0, 0x8030, 0x08
9 "9", 0, 0x8030, 0xFF, 0, 0x8030, 0x09
10 "10", 0, 0x8030, 0xFF, 0, 0x8030, 0x0A
11 "11", 0, 0x8030, 0xFF, 0, 0x8030, 0x0B
12 "12", 0, 0x8030, 0xFF, 0, 0x8030, 0x0C
13 "13", 0, 0x8030, 0xFF, 0, 0x8030, 0x0D
14 "14", 0, 0x8030, 0xFF, 0, 0x8030, 0x0E
15 "15", 0, 0x8030, 0xFF, 0, 0x8030, 0x0F
16 "16", 0, 0x8030, 0xFF, 0, 0x8030, 0x10
17 "17", 0, 0x8030, 0xFF, 0, 0x8030, 0x11
18 "18", 0, 0x8030, 0xFF, 0, 0x8030, 0x12
19 "19", 0, 0x8030, 0xFF, 0, 0x8030, 0x13
20 "20", 0, 0x8030, 0xFF, 0, 0x8030, 0x14
21 "21", 0, 0x8030, 0xFF, 0, 0x8030, 0x15
22 "22", 0, 0x8030, 0xFF, 0, 0x8030, 0x16
23 "23", 0, 0x8030, 0xFF, 0, 0x8030, 0x17
24 "24", 0, 0x8030, 0xFF, 0, 0x8030, 0x18
25 "25", 0, 0x8030, 0xFF, 0, 0x8030, 0x19
26 "26", 0, 0x8030, 0xFF, 0, 0x8030, 0x1A
27 "27", 0, 0x8030, 0xFF, 0, 0x8030, 0x1B
28 "28", 0, 0x8030, 0xFF, 0, 0x8030, 0x1C
29 "29", 0, 0x8030, 0xFF, 0, 0x8030, 0x1D
30 "30", 0, 0x8030, 0xFF, 0, 0x8030, 0x1E
31 "31", 0, 0x8030, 0xFF, 0, 0x8030, 0x1F
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33 "33", 0, 0x8030, 0xFF, 0, 0x8030, 0x21
34 "34", 0, 0x8030, 0xFF, 0, 0x8030, 0x22
35 "35", 0, 0x8030, 0xFF, 0, 0x8030, 0x23
36 "36", 0, 0x8030, 0xFF, 0, 0x8030, 0x24
37 "37", 0, 0x8030, 0xFF, 0, 0x8030, 0x25
38 "38", 0, 0x8030, 0xFF, 0, 0x8030, 0x26
39 "39", 0, 0x8030, 0xFF, 0, 0x8030, 0x27
40 "40", 0, 0x8030, 0xFF, 0, 0x8030, 0x28
41 "41", 0, 0x8030, 0xFF, 0, 0x8030, 0x29
42 "42", 0, 0x8030, 0xFF, 0, 0x8030, 0x2A
43 "43", 0, 0x8030, 0xFF, 0, 0x8030, 0x2B
44 "44", 0, 0x8030, 0xFF, 0, 0x8030, 0x2C
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49 "49", 0, 0x8030, 0xFF, 0, 0x8030, 0x31
50 "50", 0, 0x8030, 0xFF, 0, 0x8030, 0x32
51 "51", 0, 0x8030, 0xFF, 0, 0x8030, 0x33
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55 "55", 0, 0x8030, 0xFF, 0, 0x8030, 0x37
56 "56", 0, 0x8030, 0xFF, 0, 0x8030, 0x38
57 "57", 0, 0x8030, 0xFF, 0, 0x8030, 0x39
58 "58", 0, 0x8030, 0xFF, 0, 0x8030, 0x3A
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98 "98", 0, 0x8030, 0xFF, 0, 0x8030, 0x62

Player verification and sources

Browser play was reviewed before this edition was published in the catalogue. The date below is the catalogue publication date, not the game’s original release date.

Browser test and catalogue publication date: October 20, 2026
Browsers and devices: PC: Chrome, Edge and Firefox. Mobile: Chrome on Android and Safari on iPhone and iPad.
Player engine and core: EmulatorJS 4.3.0-pre · arcade
Tested by: rwEmulator

Sources and editorial basis

rwEmulator reviews edition metadata, release information, game manuals and first-hand browser-play notes. Available manuals are linked below; the editorial policy explains how facts are checked and corrections are handled.

Editorial policy and sources Trust center EmulatorJS player help