Periscope Vectors

Sink the convoys. Count the tonnage. Survive the depth charges.

Periscope Vectors is a neon vector submarine game for your phone or PC. Plot a patrol across the North Atlantic, hunt down convoys and make your attack through the periscope. Then dive and dodge the depth charges when the escorts come looking for you. Your score is the tonnage you sink in one patrol.

How it plays

• The patrol chart. Tap the sea to plot your route. Convoys crawl along the shipping lanes, lone merchants wander between the coasts, and near the land there's air cover. Sail home to rearm, refuel and repair.

• Up periscope. Line up the crosshair with the predicted impact marker and fire. The torpedoes take time to run, so you have to lead your target. Freighters, tankers, coasters and their escorts, each worth its tonnage.

• Then they hunt you. Dive, and dodge the depth charges as the escorts ping for you. Change depth after every ping, hide under the thermal layer, and don't go below crush depth.

• Deck gun. Surface and shell lone ships to save your torpedoes. Watch the splashes, short or over, and bring the range in.

• AA gun. Patrol bombers make bombing runs. Lead them with the AA gun, or crash dive and get deep.

• Glowing vector graphics with a CRT glow, a tense synth soundtrack, sonar pings and klaxons. Music and sound effects can each be switched off.

• Generic ships and aircraft, with no real navies or flags.

Made by 3BL_Indie in County Down, Northern Ireland. More at gamesdevni.site.