Vex 4: How to Play, Controls, Acts, and Where to Play Online

Vex 4 is a stickman platformer where you run, jump, slide, and swim through nine acts packed with spikes, blades, and collapsing floors. You control it with arrow keys or WASD, unlock a Hard Mode for every completed act, and can play it free in a browser without downloading anything. Below is a breakdown of the controls, the game’s structure, and where to actually launch it, including Kizi and unblocked options.

What Is Vex 4? A Stickman Platformer Overview

Vex 4 is the fourth installment in the Vex stickman platform game series, continuing the trap-heavy obstacle courses the earlier games built a following on. There’s no combat and no dialogue-driven plot to follow — the loop is purely about reading a level’s hazards fast enough to survive them. You run, jump, slide under low ceilings, and swim through submerged sections while dodging spikes, spinning blades, moving platforms, and bridges that give way the moment you step on them.

Attribution for who actually built Vex 4 is inconsistent across hosting sites. Some listings credit a developer known as Amazing Adam, while Agame’s game page presents the title as its own. Since the sources don’t agree, it’s worth treating developer credit as unsettled rather than assuming either claim is definitive.

Vex 4 Controls: Move, Jump, Crouch, and Slide

The default control scheme is the same one used across most browser versions of Vex 4, whether you’re playing via Kizi or a standalone portal like vex4.io. There’s no controller support baked in for the browser version, so keyboard input is what you’ll rely on.

• Move left/right: Left and Right arrow keys, or A and D
• Jump: Up arrow key, or W
• Crouch, slide, or drop through gaps: Down arrow key, or S

That last input does more work than it looks like. Holding down while moving lets you slide under obstacles, duck beneath swinging hazards, and in some sections it’s also how you enter a specific act or trigger a scripted sequence. If a level seems to stall, try crouching before assuming you’re stuck.

Acts, Hard Mode, Vexation, and the Challenge Room

Vex 4’s structure is built around 9 acts, and each one carries its own unlockable Hard Mode once you clear it. On top of that, the game includes a separate mode called Vexation and an expanding Challenge Room, giving players more to chase after finishing the main act progression.

Kizi describes Vex 4 as featuring 9 acts, each with a Hard Mode you unlock by completing challenges, along with Vexation and an ever-expanding Challenge Room.

Practically, this means the core campaign isn’t the end of the content. Hard Mode reuses each act’s layout but tightens the margin for error — timing that was forgiving on a first run stops being forgiving once Hard Mode is unlocked. Vexation functions as an additional mode outside the standard act list, and the Challenge Room is described as expanding, meaning it isn’t a single fixed set of trials but something that grows over time. None of the sources break down exact challenge counts or specific unlock requirements beyond “completing challenges,” so treat Hard Mode progression as tied to clearing acts rather than a hidden currency or purchase.

If you’re aiming to unlock everything, the realistic order is: clear an act on normal difficulty first, then revisit it once Hard Mode becomes available, and treat Vexation and the Challenge Room as the long-tail content once the main 9 acts are done.

Where to Play Vex 4 Online, Including Kizi and Unblocked Versions

Vex 4 can be played for free directly in a browser with no registration required, which is the main reason it’s stayed popular in school and workplace settings where installing software isn’t an option. Two of the most referenced hosting points are Kizi’s Vex 4 page and vex4.io, both of which run the game instantly without a download.

Platform support differs depending on where you access it. Agame lists Vex 4 as available on the Apple App Store and Google Play in addition to browser play, and describes the game as playable across desktop and mobile platforms. That breadth isn’t confirmed to apply uniformly across every portal, so don’t assume a mobile app is guaranteed just because you found a browser link — check the specific site you’re using before expecting app-store availability.

The search for “Vex 4 unblocked” usually points to third-party mirror sites built to bypass network restrictions on school or office computers. These aren’t officially affiliated with the original creator, and there’s no way to verify what’s actually running on any given unblocked host before you load it. If a network already allows access to Kizi or vex4.io, sticking with those is the more straightforward route since they’re the sources this guide can actually confirm.

Tips for Surviving Vex 4’s Toughest Traps

Most deaths in Vex 4 come from mistiming a jump or a slide by a fraction of a second, not from not knowing what a hazard does. The obstacle types repeat across acts — spikes, spinning blades, moving platforms, collapsing bridges, and swimming segments — so getting comfortable with the input timing for each one carries over even as the layouts get harder.

• Treat crouch-sliding as a reflex, not a last resort. Since down/S doubles as slide and crouch, practice tapping it early rather than reacting after you’ve already hit a low obstacle.
• Watch collapsing bridges before you commit to a jump. These sections punish hesitation and over-committal equally — a beat too slow and the platform is gone, a beat too early and you land on nothing.
• Replay a cleared act before touching its Hard Mode. Since Hard Mode reuses the same layout with less margin for error, muscle memory from the normal run is what actually gets you through it.
• Slow down in swimming segments. Movement handles differently underwater than on platforms, and misjudging that shift is a common cause of avoidable deaths near spike-lined tunnels.
• Use the Challenge Room to warm up, not just to chase completion. Since it’s described as expanding rather than fixed, revisiting it periodically doubles as practice for whatever act you’re currently stuck on.

None of Vex 4’s difficulty comes from hidden mechanics — it’s entirely about consistent timing under pressure, which is why acts that felt impossible on a first attempt usually click once the pattern is memorized.