It's Worms Armageddon's Armageddon mode. I've been a Worms player since 1995 and I never seem to grow tired of those early Worms games. Worms 2, Worms Armageddon and WWP all share the same engine and they are very similar but WA has been patched, is available on Steam and it's easy to play online so we usually play that version these days.
Sadly the series has been in steady decline since Worms 3D. The game you mention, Worms Reloaded is a rather crappy port of a
360 game, it's very limited (fewer weapons and themes) and everything feels off thanks to different physics and other poor design choices, it also has truly horrific netcode. I never played the more recent Worms games.