Sat, 30 May 2026, 02:00 UTC — Sun, 31 May 2026, 02:00 UTC 

On-line

Singapore

Grey Cat The Flag event.

Format: Jeopardy Jeopardy

Official URL: https://ctf.nusgreyhats.org/

This event's future weight is subject of public voting!

Rating weight: 47.50 

Event organizers 

[CTF TIME AMENDMENT] GreyCTF 2026 Qualifiers will be held from 30 May 10am (SGT GMT+8) to 31 May 10am (SGT GMT+8)

Grey Cat The Flag is an annual CTF organized by NUS Greyhats, supported by National Cybersecurity R&D Labs (NCL).

Top eligible academic teams will continue to compete in the Grey Cat The Flag finals in Singapore. Please refer to https://ctf.nusgreyhats.org/#-stat-ctf for more details on team eligibility.

Registrations are live at https://ctfd.nusgreyhats.org/register

Do let us know if you have any queries via our discord (https://discord.gg/xWaYxeKQKX) and follow us on our socials (https://linktr.ee/nus.greyhats)

Infra sponsored by goo.gle/ctfsponsorship

Prizes

TBD

Scoreboard

418 teams total

PlaceTeamCTF pointsRating points
1 r3kapig 15825.00095.000
2 F1ux 15825.00071.250
3 UIT-TraTac 15825.00063.333
4 Red-Buddy 15825.00059.375
5 Squid Proxy Lovers 15825.00057.000
6 if this doesn't work we'll buy codex more for next year 15825.00055.417
7 UIT-Wanna.W1n 15825.00054.286
8 ARESx 14868.00050.565
9 SKSD 14865.00049.896
10 slight_smile 14837.00049.284
11 bananna 14837.00048.853
12 VSL.T1 14832.00048.478
13 blimpers 14832.00048.173
14 BKISC 14832.00047.912
15 kessoku band 13897.00044.880
16 procrastinators 13877.00044.622
17 VinSOC 13875.00044.441
18 BongBeiBin 13875.00044.286
19 n0l3rain 13875.00044.147
20 W&M 13872.00044.013
21 W4llz 13844.00043.816
22 Dacia Team 13844.00043.713
23 shaptoli 13844.00043.619
24 PUCC Sec Team 13844.00043.533
25 abc 13844.00043.454
26 estrogen (larp) 13844.00043.381
27 obelus 13844.00043.313
28 RubiyaLab 12921.00040.480
29 cyberplanet 12904.00040.370
30 NoGout 12887.00040.265
31 MEOW MEOW MEOW MEOW MEOW 12094.00037.833
32 0xFUN 11933.00037.302
33 KSAL Cyber Team 11927.00037.239
34 N00b 11154.00034.877
35 vianu_hack 11123.00034.744
36 KCSC 11029.00034.424
37 Thinking Tinkerers 10987.00034.262
38 IRESDTU 10549.00032.914
39 here comes the clanker 10545.00032.870
40 milworms 10369.00032.311
41 W4terDr0p 10313.00032.114
42 Abyss Of Darkness 10200.00031.747
43 Bl4ck Drag0n 10172.00031.637
44 ハッカーかずの部屋 / Hacker Kaz's Room 10036.00031.203
45 E4T_SL33P_CTF_R3P34T 9748.00030.315
46 TeamH4C 9592.00029.824
47 amias1024 9520.00029.586
48 hackratic 9445.00029.340
49 H-T8 9384.00029.136
50 Nandy Narwhals 9331.00028.958
51 Lv1x 9292.00028.822
52 BMTC School 6.7 (Mythos Coy) 9279.00028.765
53 Crystallisers 9279.00028.748
54 ite25 8480.00026.333
55 1nf1n1ty 8312.00025.813
56 UIT-Themis 8143.00025.290
57 0xHUST 8044.00024.978
58 CYBERDUNE CLUB 8036.00024.940
59 youngdu 7989.00024.785
60 CSU CTF TEAM 7989.00024.771
61 CreateRemoteThread 7914.00024.533
62 4fun 7710.00023.908
63 NoENV 7377.00022.897
64 test123 7229.00022.441
65 L0ck8y7e 7091.00022.015
66 nothing special 7020.00021.791
67 AIVINA 6960.00021.600
68 InitCredGang 6521.00020.272
69 idktheflag 6383.00019.847
70 BIT 6322.00019.655
71 auto_calf 6171.00019.192
72 UIT - 34 Linh Xuan 5984.00018.621
73 organizers 5893.00018.339
74 Team Hunter 5834.00018.153
75 watalab 5829.00018.130
76 Confidential 5521.00017.197
77 Aju speed 5463.00017.015
78 MARS 5443.00016.947
79 WillHackForBeer 5387.00016.771
80 G4mra 5374.00016.724
81 Kheshig 5162.00016.081
82 larvartar 5141.00016.010
83 KR_SLHR 5002.00015.586
84 SpeedyGoose 4977.00015.504
85 cyber673 4930.00015.357
86 InfoSecIITR 4823.00015.029
87 z0d1ak 4712.00014.689
88 kapkan trap detectors 4630.00014.437
89 Lighth0use 4610.00014.371
90 Bl@ck_R0b0t 4606.00014.353
91 J0Y_B0Y 4606.00014.347
92 pkg signing 4571.00014.237
93 LeetSh4d0ws 4565.00014.213
94 MindCrafters 4466.00013.910
95 CoolBingo 4442.00013.833
96 Socks 4430.00013.792
97 esicudi 4299.00013.393
98 Qu4nt1x 4186.00013.049
99 rwandi 4169.00012.993
100 f4n_n3r0 4105.00012.796
101 doujiang 4058.00012.651
102 Bugs B0unt3r 4056.00012.640
103 kat 3911.00012.200
104 char kway teow 3798.00011.857
105 BlitzHack 3774.00011.780
106 kill -9 3728.00011.638
107 HKUSTFirebird 3688.00011.514
108 Niobium 3661.00011.429
109 0xCAFEBABE 3621.00011.305
110 xlevn 3615.00011.283
111 Rea11y Annoying Bots(RAB) 3475.00010.858
112 HexOnTheBeach 3454.00010.792
113 hello world has been takene 3450.00010.776
114 KazHackStan 3403.00010.631
115 m!ni0ns 3137.0009.829
116 <OOO> 3122.0009.780
117 {FL4G_404} 3099.0009.708
118 prata 3091.0009.680
119 Cyb3r Invasion Army(CIA) 3075.0009.629
120 Winterflake 3063.0009.590
121 Voyaging Star's Farewell 3026.0009.475
122 sieunhangao 3016.0009.442
123 lide 2998.0009.385
124 THR 2993.0009.367
125 CrOwOatia 2972.0009.301
126 dacuhuki 2930.0009.172
127 -w- 2911.0009.112
128 Ducks 2828.0008.860
129 ritorito 2803.0008.782
130 Lost Kids 2774.0008.692
131 j0bApp1iC4T10n 2755.0008.632
132 dcua 2750.0008.614
133 Prismatic Prismatic 2728.0008.545
134 oranghe 2599.0008.156
135 Thryve 2594.0008.138
136 Br0k3n_Sh11L 2518.0007.907
137 xylo 2347.0007.391
138 EDISEC 2335.0007.353
139 YmFzZTY0 2326.0007.323
140 Chicken_Warrior 2306.0007.261
141 RusaArmedForces 2302.0007.247
142 OmniCYBR 2251.0007.091
143 limkopi 2243.0007.065
144 Panzerjägerabteilung 2180.0006.873
145 Mntcrl 2143.0006.760
146 SecMMA 2094.0006.611
147 iguessbro 2082.0006.572
148 maddweeb 2043.0006.453
149 UIT-CauBe3Tuoi 1982.0006.268
150 Digital Quad 1951.0006.173
151 NUS-data-science 1943.0006.147
152 Nattt 1931.0006.109
153 NE_OTCHISLYAITE 1882.0005.959
154 Snipers 1882.0005.957
155 chocolate chip 1851.0005.862
156 JSoyke 1831.0005.800
157 PBR | UCLA 1819.0005.762
158 fanztrevah 1811.0005.736
159 OteriHack 1775.0005.627
160 MeowBread 1748.0005.544
161 PKA_CyberSecurity 1748.0005.542
162 tinkerbell 1744.0005.528
163 luckinplssponsor 1731.0005.487
164 Blue0ps 1724.0005.464
165 ICEDTEA 1699.0005.388
166 F0undM3 1675.0005.314
167 NoThoughtsPurePrompts 1648.0005.231
168 jushereforfun 1644.0005.217
169 Vibe Hackers 1568.0004.988
170 the game of chuds 1544.0004.914
171 FJY 1544.0004.912
172 MILK 1527.0004.860
173 N!ghtM4re 1524.0004.849
174 Phish and Chips ver 2.0 1468.0004.679
175 Catafya 1424.0004.546
176 Ph0_V@nG_nH0_Hon3y 1424.0004.544
177 husor 1411.0004.504
178 UIT-k1ll3r 1407.0004.490
179 SG CyberOlympians Team 1 1399.0004.465
180 UVT-CTF 1399.0004.463
181 ... 1375.0004.390
182 TohWeeAlex 1375.0004.388
183 Phish and Chips 1344.0004.294
184 SFrev 1275.0004.085
185 Fruity 1244.0003.991
186 cat touchers 1244.0003.989
187 B3alth S3ciety 1224.0003.928
188 Kikuri'sbeerpacket 1224.0003.927
189 no_solve 1207.0003.874
190 CyKOR 1204.0003.864
191 418 Teapots 1144.0003.682
192 HE! 1144.0003.681
193 CTFlarpers 1144.0003.680
194 chk 1124.0003.619
195 Demon Kings 1107.0003.566
196 /dev/stp 1107.0003.565
197 SUUUUUU 1100.0003.543
198 2CowHorse 1100.0003.542
199 hahahahactf 1051.0003.393
200 TWICE-SamTuaBaht 1044.0003.371
201 Przemysław-Brzęczyszczykiewicz 1044.0003.370
202 nongnongago 1034.0003.339
203 Perperikon 1024.0003.308
204 Pinnacle Carnivore 1000.0003.234
205 CC!T 1000.0003.233
206 HotPotato 1000.0003.232
207 VOID_Walkers 1000.0003.231
208 WillHack4Coffee 1000.0003.230
209 Pr0gressive_B1ts 1000.0003.229
210 n00b@root 975.0003.153
211 FPT.Hx2NL 924.0002.999
212 ww_t_sbornaya_ww 924.0002.998
213 Petir Cyber Security 905.0002.939
214 CYDEVILS 900.0002.923
215 JRAY 900.0002.922
216 HelloGoodbye 900.0002.921
217 yummy 900.0002.920
218 Yes 883.0002.868
219 Pwn-la-Chapelle 883.0002.867
220 Elden_Cat 851.0002.770
221 disabled fishes 844.0002.748
222 CATBOX 844.0002.747
223 bERM4L4TanG 844.0002.746
224 ABCDenialE 844.0002.745
225 Error404z 844.0002.744
226 SMU Blackhats 800.0002.611
227 Dead Pirate Society 800.0002.611
228 G0ld3n_Kn1ght 800.0002.610
229 I got reincarnated as an S rank CTF Adventurer! 800.0002.609
230 NUT Flaggers 800.0002.608
231 Wnuki Makajlera 800.0002.607
232 ByteBandits 800.0002.606
233 HypeCreators😈 800.0002.605
234 Dingus 800.0002.604
235 Antasia 800.0002.603
236 pwnonly 787.0002.564
237 Nusahack 783.0002.551
238 Cryptonite 783.0002.550
239 notValo 775.0002.525
240 me0ww 744.0002.431
241 UIT-4_littl3_c4t 724.0002.370
242 na 700.0002.297
243 n00bs 700.0002.297
244 Ph0en1x 700.0002.296
245 familyshark 700.0002.295
246 CS Team - Inatel 700.0002.294
247 chunky 644.0002.125
248 z3n 644.0002.125
249 GrimSec Ops 600.0001.992
250 ZeroTrust 600.0001.991
251 FengShuiMaster 600.0001.990
252 CtrlAltTab 600.0001.989
253 UIT-xJ3LL7f1x 600.0001.989
254 AtaybShiba 600.0001.988
255 3rror_N0_n4m3 600.0001.987
256 d4rkc0de 600.0001.986
257 Batma(n-1) 600.0001.986
258 shinobu1236 551.0001.838
259 Wade 551.0001.837
260 Ban Mian 500.0001.683
261 barataribeiro 500.0001.683
262 ssu2 500.0001.682
263 motormueld 500.0001.681
264 T4coTurt13 500.0001.681
265 sanity check 500.0001.680
266 I JUST HIT THE JACKPOT 500.0001.679
267 Pasukan Keselamatan Virtual 500.0001.679
268 brawl stars 500.0001.678
269 KAIT RED 500.0001.677
270 PineAppleUnderTheSea 500.0001.677
271 Hackalypse 500.0001.676
272 Team Wi-Fighters 483.0001.624
273 codexteam_0d78cfccdc 444.0001.507
274 agentteam1780119268 444.0001.506
275 team_y6l2xw8c 444.0001.505
276 cyog 444.0001.505
277 H00kS1t3 424.0001.444
278 Skywarp 400.0001.371
279 Im_trying 400.0001.371
280 2026Grey 400.0001.370
281 Cyph3rX 400.0001.370
282 Obsidian Payload 400.0001.369
283 potato 400.0001.368
284 TEAM 400.0001.368
285 y2k 400.0001.367
286 USECT 400.0001.367
287 upbhack 400.0001.366
288 Flute2Fl4g 400.0001.366
289 St1lk3r 400.0001.365
290 JapaneseFrenchToast 400.0001.364
291 Anh3mB4cKy 400.0001.364
292 Ambr0s1a! 400.0001.363
293 DR0G3N_H3X 400.0001.363
294 BARRACUDA TEAM 400.0001.362
295 mekronix 400.0001.362
296 Article_kelp 383.0001.310
297 harntest 375.0001.286
298 helloworld! 300.0001.060
299 runtime terror 300.0001.059
300 UIT-N07_FR0M_U17 300.0001.059
301 Glitch Squad 300.0001.058
302 Quackers 2.0 300.0001.058
303 wzyd 300.0001.057
304 No Fear No Idea 300.0001.057
305 Blackie 300.0001.056
306 LaM 300.0001.056
307 no-comm 300.0001.055
308 Ducks2 300.0001.055
309 Kiwi 300.0001.054
310 GrannyCalled 300.0001.054
311 A1_Ch1ck3n_H4ck3r 300.0001.053
312 RAAGOO 300.0001.053
313 UIT-N0Br4in3rs 300.0001.052
314 0xF1R3 300.0001.052
315 UIT-AURA 300.0001.051
316 BITSkrieg 300.0001.051
317 TRServer 300.0001.050
318 thunopro 300.0001.050
319 Bingung ngasih nama tim 300.0001.049
320 PSO 283.0000.998
321 dahongpao 224.0000.820
322 Anyhow 200.0000.748
323 yowezkan 200.0000.747
324 Apexteam 200.0000.747
325 Xsparks 200.0000.746
326 3 chàng lính ngự lâm 200.0000.746
327 okcan 200.0000.746
328 sf_lm 200.0000.745
329 fingolfin 200.0000.745
330 TopFrag 200.0000.744
331 SMH 200.0000.744
332 Cyberlabs IIT(ISM) 200.0000.743
333 FunHackers 200.0000.743
334 Marchember 200.0000.743
335 flagspls 200.0000.742
336 0xstrawhats 200.0000.742
337 codeclowncreation 200.0000.741
338 vodanh 200.0000.741
339 Martial_Law_Enforcer 200.0000.740
340 UIT-SudoAptInsall 200.0000.740
341 Team Cryptellas 200.0000.740
342 4r0wana 200.0000.739
343 cc4dhn1m 200.0000.739
344 ne_prishli_pohavat'_team 200.0000.738
345 aamaterasu 200.0000.738
346 ryc 200.0000.738
347 tha-tux 200.0000.737
348 looklookseesee 200.0000.737
349 0xRoot2Pwn 200.0000.736
350 ctfraid 200.0000.736
351 Rendom 200.0000.736
352 THAnks4Shell 200.0000.735
353 seXure_shell 200.0000.735
354 Oinodecam 200.0000.734
355 codexteambaf53421 183.0000.683
356 UIT-CanhHoaHeoTan 100.0000.434
357 KJ_404Error 100.0000.433
358 5om3_boy5_fell0k 100.0000.433
359 Alone 100.0000.432
360 case 100.0000.432
361 OverClockedMinds 100.0000.432
362 J 100.0000.431
363 15Toan_QHH 100.0000.431
364 fish 100.0000.431
365 envysUS 100.0000.430
366 Giving Up 100.0000.430
367 P4ND4 100.0000.430
368 GP system 100.0000.429
369 Raumania 100.0000.429
370 KhaosCTF 100.0000.429
371 Falcons 100.0000.428
372 Svnfl0w3r 100.0000.428
373 FunCTF1234 100.0000.428
374 wOrKsOnMyMaChInE 100.0000.427
375 toez 100.0000.427
376 K3PL3R 100.0000.426
377 SoloV1 100.0000.426
378 rookie raspberry 100.0000.426
379 Dunderpatrullen 100.0000.425
380 Xür 100.0000.425
381 V1t 100.0000.425
382 team1780132082 100.0000.425
383 Hacktivate 100.0000.424
384 codex_spidr_team_4ssffx 100.0000.424
385 whoknows 100.0000.424
386 fanfan 100.0000.423
387 the_underdog$ 100.0000.423
388 Skensajaya 100.0000.423
389 Sephora 100.0000.422
390 kamehameha 100.0000.422
391 HCS 100.0000.422
392 toto 100.0000.421
393 melinoe 100.0000.421
394 recyclebin 100.0000.421
395 nullVector 100.0000.420
396 funday 100.0000.420
397 FriteSec 100.0000.420
398 hide_on_bush 100.0000.420
399 Whiteberry 100.0000.419
400 Jobless_Joey 100.0000.419
401 clareeses 100.0000.419
402 Safe Hex Only 100.0000.418
403 Syntax Terror 100.0000.418
404 UFK 100.0000.418
405 acst 100.0000.417
406 Vector404 100.0000.417
407 fxxmm 100.0000.417
408 justtryingtofindflags 100.0000.417
409 DragonSec SI 100.0000.416
410 K3RNIX 100.0000.416
411 whattheleaf 100.0000.416
412 God Tier 100.0000.415
413 LabubaTeam 100.0000.415
414 BRACU_SHIKARI 100.0000.415
415 3ms3sc 100.0000.415
416 lacalorporlanoche 100.0000.414
417 form up half sacks 100.0000.414
418 Darkreunion 100.0000.207
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