Is Portal 2 Available on Nintendo 64?

No. Portal 2 released in 2011. Nintendo 64 launched 1996, discontinued 2002. The hardware gap is 9+ years.

Portal 2 Platforms

• Windows / Mac / Linux (Steam)
• PlayStation 3 (with Steamworks cross-play)
• Xbox 360
• Nintendo Switch (Portal: Companion Collection, 2022 — includes Portal 1 & 2)

Why N64 Can't Run It

• CPU: 93.75 MHz MIPS III vs. Portal 2's min 2.0 GHz x86.
• RAM: 4 MB (8 MB Expansion Pak) vs. 2 GB min.
• GPU: Fixed-function RDP vs. Shader Model 3.0 / DirectX 9.
• Storage: 64 MB cart max vs. 12 GB install.

Portal on Retro Hardware?

• Portal (2007) — Source Engine min spec: 1.7 GHz, 512 MB, DX8. Still impossible on N64.
• Homebrew Ports: None. Source Engine is closed-source (Valve).
• Similar N64 Puzzle Games: Tetrisphere, Wetrix, Bust-A-Move '99.

Play Portal 2 on Switch (portable, gyro aiming) or PC (workshop mods, co-op). It's one of the best games ever made — worth a modern platform.