internal/Internal-Services.md
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@@ -140,6 +140,15 @@ Repository Mirrors are listed on another page: [Repository Mirrors](/services/Re
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| terraria.pebkac.dn42:7777 (IPv4 only/TCP) | [Terraria](https://terraria.org/) | Ask [TOMKAP-DN42](https://explorer.dn42.pebkac.gr/?#/person/TOMKAP-DN42) for password/whitelisting |
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| The burble.dn42 shell servers include a number of classic text games, see [shell access](https://dn42.burble.com/services/shell/#classic-games) | Various | Log in to the shell servers for more |
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+## Challenges
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+Test out your skills with online challenges
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+| Start here | Remarks |
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+|:------------------------------------------------- |:---------------------------------- |
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+| https://burble.dn42/services/ping/ | burble.dn42 ping challenge |
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## Shell
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Providers of shell access: